Containment unit and object

Abstract

To provide a container and an object that can identify (or facilitate identification of) the type or state of a play medium placed on an object surface in the real world while enabling the use of existing play objects in a game. [Solution] The container (70) is for storing individual game media (60) used in a game played using game media (60) placed on the target surface, and includes an IC tag (73) for holding specific information for identifying the type or state of the game media (60) placed on the target surface while stored in the container (70).

Description

[Technical Field] 【0001】 The present invention relates to a container for containing individual game media used in a game played using game media placed on a target surface, and to an object contained in the container together with the game media. [Background technology] 【0002】 Games that are played using real game media placed on a target surface set in the real world are known. One example of such a game is a card game in which two players compete against each other by placing real cards on a game field. For example, a card game similar to the card game described in Patent Document 1 is played on a game field in the real world using real cards. [Prior art documents] [Patent documents] 【0003】 [Patent Document 1] Japanese Patent Application Publication No. 2018-175635 Summary of the Invention [Problem to be solved by the invention] 【0004】 In the case of card games like the one described above, there is a demand for people other than the players to watch the matches. In this regard, by using the system to identify the type and state of the cards placed on the game field and displaying an image showing the current state of the game field on a display unit for spectators based on the identification results, more people, including people in distant locations, can watch the card game matches. 【0005】 One possible method for the system to identify the type and status of cards placed on the game field is to install a camera unit to take pictures of the game field and identify the type and status of the cards placed on the game field from the images captured by the camera unit. However, there are cases where it is not possible (or difficult) to identify the type and status of the cards placed on the game field from the captured images. 【0006】 For example, in general, cards used in card games have a front surface that has an appearance that corresponds to the card type, and a back surface that has a common appearance regardless of the card type, so when identifying the type of card placed on the game field from a photographed image, the card type is identified from the front surface of the card that appears in the photographed image. However, due to the rules of card games, cards may be placed on the game field face down, and in such cases, the front surface of the card is not visible in the photographed image, making it impossible to identify the card type from the photographed image. 【0007】 Furthermore, for example, it may be difficult to identify the type and state of a card placed on the game field from a photographed image due to the influence of ambient light, etc. Among the cards used in card games, there are several types of cards that have been specially processed (for example, holograms, etc.), and it is difficult to identify the type and state of such cards from a photographed image. 【0008】 It is possible to incorporate a special mechanism into the cards themselves to make it possible (or easier) to identify the type and status of cards placed on the game field, but in this case, problems may arise, such as existing cards (cards that do not have the above mechanism) becoming unusable in the game. 【0009】 The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a container and object that allows existing play objects to be used in games, while making it possible to identify (or make it easier to identify) the type or state of play media placed on a target surface in the real world. [Means for solving the problem] 【0010】 In order to solve the above problem, one embodiment of the present invention provides a container for storing individual game media used in a game played using game media placed on a target surface, and includes an IC tag for retaining specific information for identifying the type or state of the game media placed on the target surface while contained in the container. 【0011】 Furthermore, an object according to one embodiment of the present invention is an object that is housed in a container together with individual game media used in a game played using game media placed on a target surface, and includes an IC tag for retaining specific information for identifying the type or state of the game media placed on the target surface while housed in the container. [Brief explanation of the drawings] 【0012】 [Figure 1] 1 is a diagram illustrating an example of a configuration of a system according to an embodiment of the present invention. [Figure 2A] FIG. 10 is a diagram showing an example of the appearance of the front surface of a card. [Figure 2B] FIG. 10 is a diagram showing an example of the appearance of the back side of a card. [Figure 3] FIG. 2 is a diagram illustrating an example of a game field. [Figure 4] FIG. 10 is a diagram illustrating an example of an arrangement format of character cards. [Figure 5] FIG. 10 is a diagram for explaining an example of a sleeve. [Figure 6] FIG. 1 is a diagram illustrating an example of a game board. [Figure 7] FIG. 10 is a diagram showing an example of the state of a game field. [Figure 8] FIG. 10 is a diagram showing an example of a game field image. [Figure 9] FIG. 10 is a diagram showing an example of a game field image when any card is designated. [Figure 10] FIG. 10 illustrates an example of an association process. [Figure 11] FIG. 10 is a diagram illustrating an example of association data. [Figure 12] FIG. 10 is a diagram illustrating another example of the association process. [Figure 13] FIG. 10 illustrates an example of a specification process. [Figure 14] FIG. 10 is a diagram illustrating an example of an area set in a captured image. [Figure 15] FIG. 10 is a diagram showing an example of first identification result data. [Figure 16] FIG. 10 is a diagram showing an example of second identification result data. [Figure 17] FIG. 10 is a diagram showing an example of game field situation data. [Figure 18] FIG. 10 is a diagram illustrating an example of a display control process. [Figure 19] FIG. 10 is a diagram illustrating an example of processing executed in a display terminal processing. [Figure 20] FIG. 10 is a diagram for explaining an example of an object that may be housed in the sleeve together with the card. [Figure 21] FIG. 10 is a diagram illustrating another example of an antenna of a reading device. [Figure 22] FIG. 2 is a functional block diagram showing functional elements of the system. [Figure 23] 10A and 10B are diagrams for explaining an example of a sleeve according to a second embodiment. [Figure 24] FIG. 10 is a diagram for explaining identification of the orientation of a card. [Figure 25] FIG. 10 is a diagram for explaining identification of the orientation of a card. [Figure 26] FIG. 10 is a diagram illustrating an example of first identification result data according to the second embodiment. [Figure 27] FIG. 10 is a diagram illustrating an example of second identification result data according to the second embodiment. [Figure 28] FIG. 10 is a functional block diagram showing functional elements of a system according to a second embodiment. [Figure 29] 10A and 10B are diagrams for explaining an example of a sleeve according to a third embodiment. [Figure 30] FIG. 11 is a diagram illustrating an example of an association process according to the third embodiment. [Figure 31] FIG. 11 is a diagram illustrating an example of association data according to the third embodiment. [Figure 32] FIG. 11 is a diagram illustrating another example of the association process according to the third embodiment. [Figure 33] FIG. 13 is a diagram illustrating an example of first identification result data according to the third embodiment. [Figure 34] FIG. 13 is a diagram illustrating an example of second identification result data according to the third embodiment. [Figure 35] FIG. 10 is a functional block diagram showing functional elements of a system according to a third embodiment. [Figure 36] FIG. 10 is a diagram illustrating an example of the configuration of a system according to a fourth embodiment. [Figure 37] 10A and 10B are diagrams for explaining an example of a sleeve according to a fourth embodiment. [Figure 38] FIG. 13 is a diagram illustrating an example of an association process according to the fourth embodiment. [Figure 39] FIG. 13 is a diagram illustrating an example of association data according to the fourth embodiment. [Figure 40] FIG. 13 is a diagram illustrating an example of a specifying process according to the fourth embodiment. [Figure 41] FIG. 13 is a diagram illustrating an example of second identification result data according to the fourth embodiment. [Figure 42] FIG. 10 is a functional block diagram showing functional elements of a system according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION 【0013】 Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. 【0014】 [1. First Embodiment] A system according to a first embodiment of the present invention will be described. 【0015】 FIG. 1 shows an example of the configuration of a system 1 according to a first embodiment. The system 1 is a system related to a game played using real objects placed on an object surface set in the real world. As will be described later, the system 1 includes a function as an identification system for identifying the type and state of the object placed on the object surface in the game. The system 1 also includes a function as a display control system for causing a display means to display a display relating to the object placed on the object surface in the game. 【0016】 For example, a card game played using cards corresponds to an example of a "game played using an object placed on an object surface." Below, the system 1 according to the first embodiment will be described using as an example a competitive card game (trading card game) in which a player sets a deck by combining any cards he or she owns in accordance with predetermined rules, and uses the deck to play against other players. 【0017】 [1-1. Overview of the Card Game] Before explaining the configuration of the system 1, an overview of the card game will be given. 【0018】 2A and 2B show an example of a card used in a card game. A card 60 is a rectangular object made of a material such as paper. 【0019】 Fig. 2A shows an example of the appearance of a front surface 61 of a card 60. Fig. 2A shows, as an example of a card 60, a character card, which is a card showing a character. 【0020】 As shown in FIG. 2A, information about the card 60 is written on the front surface 61 of the card 60. Since FIG. 2A shows a character card, information about the character is written on the front surface 61. For example, the front surface 61 includes parts P1, P2, P3, P4, and P5. Part P1 indicates the name of the card 60 (character). Part P2 is an image of the character. Part P3 indicates an explanation about the character. Part P4 indicates the character's attack power (ATK) and defense power (DEF). Part P5 indicates a card ID. The card ID is information that identifies each card type. For example, the appearance (design, text, etc.) of the front surface 61 of the card 60 differs for each card type, and cards 60 with the same front surface 61 appearance have the same card ID, while cards 60 with different front surface 61 appearances have different card IDs. For example, cards 60 representing different characters have different card IDs. If there is only one type of card 60 representing a character with the same name, the card IDs of the cards 60 representing the same character are the same. On the other hand, if there are multiple types of cards 60 that show characters with the same name but have different appearances on the front 61, the card IDs of these multiple types of cards 60 are different. For example, if there are multiple types of cards 60 that show characters with the same name but have different rarities or ranks, the card IDs of these multiple types of cards 60 are different. 【0021】 In FIG. 2A, an example of a character card is shown as an example of a card 60 used in a card game, but cards 60 representing things other than characters are also used in card games. For example, magic cards representing magic spells and trap cards representing traps are used. As with character cards, information about the magic or trap is written on the surface 61 of magic cards and trap cards. 【0022】 2B shows an example of the appearance of the back surface 62 of a card 60. The back surface 62 of the card 60 has an appearance that is common to all cards used in a card game. In other words, the back surface 62 of the card 60 has a common appearance regardless of the type of card 60. For this reason, the type of card 60 cannot be identified from the appearance of the back surface 62. 【0023】 The card game progresses by the first and second players placing cards 60 on the game field. Figure 3 shows an example of the game field F. As shown in Figure 3, the game field F includes a first player field F1, a second player field F2, and a shared field F3. 【0024】 The first player field F1 is an area for placing the first player's cards 60. The first player field F1 includes a plurality of zones Z1 to Z14. 【0025】 For example, zone Z7 is an area where the first player's deck is placed as a stockpile. Here, a "deck" refers to a stack of cards 60 that a player has arbitrarily combined from their own cards 60 in accordance with certain rules when playing a card game, and a "stockpile" refers to a deck that has been shuffled and placed face down. The first player can draw cards from the stockpile placed in zone Z7 and add them to his or her hand. 【0026】 Moreover, the zones Z2 to Z6 and Z8 to Z13 are areas where the first player can place any card 60 selected from his / her hand. 【0027】 For example, zones Z9 to Z13 are areas where the first player places character cards from his / her hand. By placing character cards from his / her hand in zones Z9 to Z13, the first player becomes able to use the characters in battle (attack, etc.). 【0028】 Furthermore, for example, zones Z2 to Z6, and Z8 are areas where the first player places magic cards or trap cards from his / her hand. By placing magic cards or trap cards from his / her hand in zones Z2 to Z6, and Z8, the first player can cause the effects of magic or traps to occur in the card game. 【0029】 For example, zone Z14 is an area for placing character cards of defeated characters and used magic or trap cards. Zone Z1 is an area for placing a stack of special cards 60 that can be placed in zones Z29 and Z30 of the shared field F3. Under certain conditions, the first player can place a card 60 from the stack of special cards 60 placed in zone Z1 in zone Z29 or Z30. 【0030】 The second player field F2 is an area for placing the second player's cards 60. The second player field F2 includes multiple zones Z15 to Z28. The meanings and roles of the zones Z15 to Z28 are the same as those of the zones Z1 to Z14 of the first player field F1, so a description thereof will be omitted. 【0031】 The shared field F3 is a shared area between the first player and the second player. The shared field F3 includes multiple zones Z29 and Z30, and both the first player and the second player can place cards 60 in the zones Z29 and Z30 under predetermined conditions. 【0032】 In the following description, when there is no need to distinguish between the zones Z1 to Z30, they will be collectively referred to as "zone Z." 【0033】 Card games are played in a turn-based manner, i.e., a first player's turn and a second player's turn are alternately played repeatedly. 【0034】 During the first player's turn, the first player draws a card 60 from the pile of cards 60 placed in zone Z7 (the first player's deck) and adds the drawn card 60 to his / her hand. Under certain conditions, the first player places any card 60 from his / her hand in zones Z2 to Z6, Z8 to Z13, or any card 60 from the pile of special cards 60 placed in zone Z1 in zones Z29, Z30, and uses his / her card 60 placed on game field F to attack the second player, etc. 【0035】 Similarly, during the second player's turn, the second player draws a card from the pile of cards 60 placed in zone Z21 (the second player's deck) and adds the drawn card 60 to his / her hand. Under certain conditions, the second player places any card 60 from his / her hand in zones Z16 to Z20 or Z22 to Z27, or any card 60 from the pile of special cards 60 placed in zone Z15 in zones Z29 or Z30, and uses his / her card 60 placed on game field F to attack the first player, etc. 【0036】 In a card game, a plurality of types of arrangement formats are defined for cards, and the presence or absence of, or the extent of, the influence that the cards have on the progress or outcome of the card game varies depending on the arrangement format. 【0037】 4 is a diagram for explaining the arrangement format of character cards. As shown in FIG. 4, in the card game, three types of arrangement formats of character cards are defined: face-up attack display, face-down defense display, and face-up defense display. 【0038】 "Face-up attack display" refers to a state in which a character card is placed face-up and vertically. "Face-up" refers to a state in which the card 60 is placed so that the front surface 61 of the card 60 is visible to the player. In other words, "face-up" refers to a state in which the card 60 is placed so that the back surface 62 of the card 60 faces the game field F. "Vertical" refers to a state in which the card 60 is placed so that the card 60 appears vertically long when viewed from the player. In other words, "vertical" refers to a state in which the card 60 is placed so that the long side of the card 60 is parallel (or approximately parallel) to the vertical direction of the game field F. By placing a character card in face-up attack display, a player can engage in battles based on the attack power (ATK) of the character card. 【0039】 "Face-down defensive display" refers to a state in which a character card is placed face down and sideways. "Face-down" refers to a state in which a card 60 is placed so that the back surface 62 of the card 60 is visible to the player, but the front surface 61 of the card 60 is not visible. In other words, "face-down" refers to a state in which a card 60 is placed so that the front surface 61 of the card 60 faces the game field F. "Sideways" refers to a state in which a card 60 is placed so that the card 60 appears long horizontally from the player's perspective. In other words, "sideways" refers to a state in which a card 60 is placed so that the long side of the card 60 is parallel (or approximately parallel) to the horizontal direction of the game field F. By placing a character card in face-down defensive display, a player can engage in battles based on the defensive strength (DEF) of the character card. 【0040】 "Face-up defensive position" is when a character card is placed face-up and sideways. By placing a character card in face-up defensive position, a player can engage in battles based on the character card's defensive strength (DEF). 【0041】 When placing a character card on the game field F, the player can generally choose between face-up attack position or face-down defense position. A character card placed in face-down defense position will change to face-up defense position if it is attacked by the opponent (1). If a player places a character card in face-down defense position, the opponent will attack the character card without knowing its name or stats (such as attack power and defense power), and will only learn its name and stats at the time of the attack. Note that a character card placed in face-down defense position may change to face-up defense position if the effect of a specific magic card is activated. A player can also change their own character card placed in face-down defense position to face-up attack position (2). Furthermore, a player can change the position of their own character card placed on the game field F between face-up attack position and face-up defense position (3). 【0042】 Similarly, in card games, multiple arrangement formats are defined for magic cards or trap cards. For example, there are two types of arrangement formats for magic cards or trap cards: face-up and face-down. "Face-up" refers to a state in which a magic card or trap card is placed face-up and vertically, and the effect of the magic or trap indicated by the magic card is activated. On the other hand, "face-down" refers to a state in which a magic card or trap card is placed face-down and vertically, and the effect of the magic or trap indicated by the magic card is waiting to be activated. A magic card or trap card placed face-down is turned face-up at the player's discretion or when a predetermined activation condition is met, and the effect of the magic or trap indicated by the magic card is activated. When a player places a magic card or trap card face down, the opponent continues the match without knowing the name or effect of the magic card or trap card, and only learns the name and effect of the magic card or trap card when it is turned face up. 【0043】 Taking into consideration the characteristics of the card arrangements described above, players select and change the card arrangements in order to negotiate with their opponents. 【0044】 In a card game, if the points (life points) of the second player, which are reduced by an attack from the first player to the second player, reach zero, the first player wins and the second player loses. On the other hand, if the points (life points) of the first player, which are reduced by an attack from the second player to the first player, reach zero, the second player wins and the first player loses. 【0045】 In this embodiment, the card 60 is used in a state where it is housed in a sleeve. FIG. 5 is a diagram for explaining the sleeve. As shown in FIG. 5, the sleeve 70 is a housing for housing one card 60. The sleeve 70 is a rectangular, bag-like object with three sides glued together and the remaining side formed as an opening, and the card 60 is housed in the sleeve 70 through the opening. The sleeve 70 is made of a synthetic resin such as polypropylene. For example, the sleeve 70 is provided (sold, etc.) separately from the card 60. 【0046】 The sleeve 70 has a front surface 71 and a back surface 72. The front surface 71 is a surface (opposing surface) that faces the front surface 61 of the card 60 when the card 60 is accommodated in the sleeve 70. The back surface 72 is a surface (opposite surface) on the opposite side of the front surface 71, and faces the back surface 62 of the card 60 when the card 60 is accommodated in the sleeve 70. As shown in FIG. 5 , the card 60 is accommodated in the sleeve 70 so that the front surface 61 of the card 60 faces the front surface 71 of the sleeve 70 (in other words, so that the back surface 62 of the card 60 faces the back surface 72 of the sleeve 70). 【0047】 The surface portion 71 of the sleeve 70 is transparent, and is configured so that the surface 61 of the card 60 housed in the sleeve 70 can be seen through the surface portion 71 from outside the sleeve 70. Note that the entire surface portion 71 does not need to be transparent; as long as the surface 61 of the card 60 housed in the sleeve 70 can be seen from outside the sleeve 70, a portion of the surface portion 71 (for example, an edge portion) does not need to be transparent. On the other hand, the back portion 72 of the sleeve 70 is opaque and has a common appearance with the back portions 72 of the other sleeves 70. In other words, the back portions 72 have a common appearance among all the sleeves 70. Therefore, it is not possible to distinguish individual sleeves 70 from the appearance of the back portions 72. For example, the back portion 72 has the same appearance as the back portion 62 of the card 60. 【0048】 The sleeve 70 includes an IC tag 73 (RFID tag). The IC tag 73 is a device capable of wireless communication such as radio waves. For example, the IC tag 73 is a passive IC tag that includes an IC chip and an antenna, receives a signal wirelessly transmitted from an IC tag reader via the antenna, and wirelessly transmits information stored in the IC chip back to the IC tag reader in response to the received signal. The IC tag 73 may also have a function of writing and storing information received from an IC tag writer via the antenna in the IC chip. The IC tag 73 is not limited to a passive IC tag, and may be an active IC tag. 【0049】 For example, the IC tag 73 is provided at a position other than the front surface 71 of the sleeve 70 so that the front surface 61 of the card 60 is not obscured by the IC tag 73 and becomes difficult to see. In this embodiment, the IC tag 73 is provided on the inner surface of the back surface 72 of the sleeve 70. For example, the IC tag 73 is attached to the inner surface of the back surface 72 by a sticker or the like. The antenna of the IC tag 73 may be printed on the inner surface of the back surface 72. In addition, a tag ID, which is information that uniquely identifies each IC tag 73, is stored in the IC chip of the IC tag 73. 【0050】 The back surface 72 of the sleeve 70 is opaque, so that the IC tag 73 cannot be seen from outside the sleeve 70. Therefore, even if there are differences in the installation positions of the IC tags 73 between sleeves 70 or there are individual differences in the IC tags 73 themselves, it is ensured that the individual sleeves 70 cannot be distinguished from the back surface 72 of the sleeve 70 based on these differences. 【0051】 Note that the back surface 72 of the sleeve 70 may be made transparent if there is no difference in the installation position of the IC tag 73 or the IC tag 73 itself, or if such differences can be ignored and there is no particular problem even if the IC tag 73 is visible from outside the sleeve 70. Furthermore, if both the front surface 71 and the back surface 72 of the sleeve 70 are made transparent, the IC tag 73 may be provided on the inner surface of the front surface 71. 【0052】 If the IC tag 73 is attached to a portion of the back surface 72 of the sleeve 70, the thickness of the portion where the IC tag 73 is attached will be greater than the thickness of the other portions, which may impair stability when multiple sleeves 70 are stacked on top of each other. For this reason, in order to make the thickness of the sleeve 70 uniform (or approximately uniform), for example, the thickness of the portion of the back surface 72 other than the portion where the IC tag 73 is attached may be made equal to the thickness of the IC tag 73, or the IC tag 73 (antenna) may be disposed over the entire inner surface (or a wide range) of the back surface 72. 【0053】 In this embodiment, the card 60 is used while housed in a sleeve 70. The sleeve 70 serves to protect the card 60 from damage and also serves to identify the type and state of the card 60 placed on the game field F, as will be described later. Hereinafter, the card 60 housed in the sleeve 70 will be referred to as a "card 60S" for convenience in order to distinguish it from the card 60 alone. In other words, when the card 60 is housed in the sleeve 70, the card 60 and the sleeve 70 will be regarded as a single object and will be referred to as a "card 60S." 【0054】 [1-2. System Configuration] Returning to Figure 1, the configuration of the system 1 according to the first embodiment will be described. As shown in Figure 1, the system 1 includes a game board 10, a photographing device 30, an information processing device 40, and a display terminal device 50. 【0055】 The game board 10 is a board on which cards are placed by a first player and a second player playing a card game. For example, the game board 10 is placed on a table 2 where the first player and the second player sit facing each other. 【0056】 The game board 10 includes a housing 11 and a mat 12 placed on the top surface of the housing 11. A game field F (zones Z1 to Z30) is drawn on the mat 12. The housing 11 and the mat 12 may be integrally formed. That is, the game field F may be drawn on the top surface of the housing 11. Hereinafter, placing a card 60S on the game board 10 (mat 12) will be described as "placing the card 60S on the game field F." 【0057】 FIG. 6 is a diagram for explaining the game board 10, showing the game board 10 as viewed from above. As shown in FIG. 6, a plurality of reading devices 20-1 to 20-30 are installed inside the housing 11 of the game board 10. Each of the reading devices 20-1 to 20-30 is an IC tag reader. The IC tag reader has an antenna for transmitting and receiving signals to and from an IC tag, and reads information stored in the IC tag (IC chip) by transmitting a signal wirelessly and receiving a signal returned from the IC tag that has received the signal. 【0058】 The readers 20-1 to 20-30 are installed to correspond to the zones Z1 to Z30 of the game field F, respectively. For example, the reader 20-1 corresponds to the zone Z1 and is installed at a position corresponding to the zone Z1. Specifically, the reader 20-1 is installed below the zone Z1 and is used to read information stored in the IC tag 73 of the card 60S placed in the zone Z1. The same applies to the readers 20-2 to 20-30. Hereinafter, when there is no need to distinguish between the readers 20-1 to 20-30, they will be collectively referred to as the "reader 20." 【0059】 The front surface 71 and back surface 72 of the card 60 and the sleeve 70 are made of a material that does not interfere with the transmission and reception of signals between the IC tag 73 and the reader 20. Therefore, whether the card 60S is placed in zone Z face up or face down, the reader 20 installed below said zone Z can read the information stored in the IC tag 73 of said card 60S. 【0060】 Furthermore, even if multiple cards 60S are stacked in one zone Z, the reading device 20 installed under the zone Z can read the information stored in the IC tag 73 of each of the multiple cards 60S. 【0061】 In addition, the reading device 20 installed under the zone Z is installed away from other zones Z so as not to read the information stored in the IC tag 73 of the card 60S placed in other zones Z. 【0062】 The game board 10 and the information processing device 40 are connected via a cable conforming to a predetermined interface standard. Alternatively, the game board 10 and the information processing device 40 can communicate with each other via a communication network. Read result data relating to the read result of the reader 20 is supplied to the information processing device 40 via the cable or communication network. 【0063】 The photographing device 30 is a visible light camera that converts an optical image obtained through a lens into an electronic image signal using an image sensor and outputs the signal. The photographing device 30 is fixed above the game board 10 (game field F) and is used to photograph the game field F. The image photographed by the photographing device 30 includes at least zones Z1 to Z30 of the game field F. 【0064】 The photographing device 30 and the information processing device 40 are connected via a cable conforming to a predetermined interface standard. Alternatively, the photographing device 30 and the information processing device 40 can communicate with each other via a communication network. The photographing device 30 photographs the game field F at predetermined time intervals, and the photographed images are supplied to the information processing device 40 via the cable or communication network. 【0065】 The information processing device 40 is a computer and includes a control unit 41, a memory unit 42, a communication unit 43, an operation unit 44, a display unit 45, and an audio output unit 46. The control unit 41 includes at least one microprocessor and executes information processing according to a program stored in the memory unit 42. The memory unit 42 includes a main memory unit (e.g., RAM, etc.) and an auxiliary memory unit (e.g., non-volatile semiconductor memory, a hard disk drive, or a solid-state drive, etc.) and stores programs and data. The communication unit 43 is for communicating with other devices via a communication network. The operation unit 44 is for an operator to perform various operations. The display unit 45 is for displaying images, such as a liquid crystal display or an organic EL display, etc. The audio output unit 46 is for outputting audio, such as a speaker or headphones, etc. The operation unit 44, the display unit 45, and the audio output unit 46 may be provided in the information processing device 40 itself or may be provided as external devices connected to the information processing device 40. For example, the display unit 45 may be a head-mounted display (HMD), a monitor, a television receiver, a projector, or the like connected to the information processing device 40 as an external device. 【0066】 The information processing device 40 identifies the type and state of the card 60S placed on the game field F (i.e., the type and state of the card 60 placed on the game field F while being held in the sleeve 70) based on the read result data of the reading device 20 and the image captured by the photographing device 30. Furthermore, based on the identification result, the information processing device 40 causes the display terminal device 50 to display a game field image showing the current situation of the game field F. The processing executed by the information processing device 40 will be described later (see FIGS. 10, 12, 13, 18, etc.). 【0067】 The display terminal device 50 is a device capable of displaying images. For example, the display terminal device 50 is a device for spectators watching a card game. Specifically, the display terminal device 50 is a terminal device (e.g., a smartphone, a tablet computer, a laptop computer, or a desktop computer) used by each spectator. As shown in FIG. 1, the display terminal device 50 is a computer including a control unit 51, a memory unit 52, a communication unit 53, an operation unit 54, a display unit 55, and an audio output unit 56. The control unit 51, the memory unit 52, the communication unit 53, the operation unit 54, the display unit 55, and the audio output unit 56 are similar to the control unit 41, the memory unit 42, the communication unit 43, the operation unit 44, the display unit 45, and the audio output unit 46. Although the operation unit 54 and the display unit 55 are shown separately in FIG. 1, the operation unit 54 and the display unit 55 may be integrally formed as a touch panel. The operation unit 54 may be a pointing device such as a mouse, a button (key), a lever (stick), or the like. The operation unit 54 may be configured so that the spectator can operate it by voice or gesture. 【0068】 In the following description, it is assumed that the display terminal device 50 is a terminal device (e.g., a smartphone) used by each spectator, but the display terminal device 50 is not limited to this. For example, the display terminal device 50 may be a dedicated display device equipped with only a display function. For example, the display terminal device 50 may be a large monitor installed in a venue where multiple spectators are present and viewed by the multiple spectators. 【0069】 For example, a game field image showing the current situation of the game field F (game board 10) is displayed on the display unit 55 of the display terminal device 50. By looking at the game field image, spectators can understand the current situation of the game field F. 【0070】 FIG. 7 shows an example of the state of the game field F (game board 10), and FIG. 8 shows an example of a game field image in the state shown in FIG. 【0071】 In the situation shown in FIG. 7, card 60S-1 is placed face-down in defense position in zone Z10. Card 60S-2 is placed face-up in attack position in zone Z12. Furthermore, card decks 600-1 (first player's deck), 600-2, 600-3 (second player's deck), and 600-4, each consisting of multiple face-down stacked cards 60S, are placed in zones Z7, Z1, Z21, and Z15, respectively. It is assumed that card deck 600-1 contains 50 cards 60S, and card deck 600-2 contains 12 cards 60S. It is also assumed that card deck 600-3 contains 45 cards 60S, and card deck 600-4 contains 15 cards 60S. 【0072】 As shown in Fig. 8, the game field image G shows the current situation of the game field F. Zones Z1 to Z30 are depicted in the game field image G. The game field image G shown in Fig. 8 includes parts PA-1, PA-2, PA-3, PA-4, PB-1, and PB-2. 【0073】 Part PA-1 is an object corresponding to card stack 600-1 placed in zone Z7, and is displayed in association with zone Z7. Part PA-2 is an object corresponding to card stack 600-2 placed in zone Z1, and is displayed in association with zone Z1. Part PA-3 is an object corresponding to card stack 600-3 placed in zone Z21, and is displayed in association with zone Z21. Part PA-4 is an object corresponding to card stack 600-4 placed in zone Z15, and is displayed in association with zone Z15. The number written on part PA-1 indicates the number of cards 60S included in card stack 600-1. The same is true for parts PA-2 to PA-4. 【0074】 Part PB-1 is an object corresponding to card 60S-1 placed in zone Z10, and is displayed in association with zone Z10. In the situation shown in FIG. 7, card 60S-1 is placed in zone Z10 in face-down defensive position, and therefore, as part PB-1, an image showing card 60 placed sideways and face down (i.e., an image showing back surface 62 of card 60 placed sideways) is displayed in a position corresponding to zone Z10. In other words, as part PB-1, an image according to the type of card 60 is not displayed, and an image regardless of the type of card 60 is displayed in a position corresponding to zone Z10. 【0075】 Part PB-2 is an object corresponding to card 60S-2 placed in zone Z12, and is displayed in association with zone Z12. In the situation shown in FIG. 7, card 60S-2 is placed in zone Z12 in face-up attack display, and therefore, as part PB-2, an image showing card 60 placed vertically and face up (i.e., an image showing the face 61 of card 60 placed vertically) is displayed in a position corresponding to zone Z12. In other words, as part PB-2, unlike part PB-1, an image according to the type of card 60 is displayed in a position corresponding to zone Z12. 【0076】 Part PB-1 is associated with a process for displaying information about card 60S-1 placed in zone Z10. Therefore, when a designation operation for designating part PB-1 (for example, a tap operation on part PB-1) is accepted, information about card 60S-1 is displayed. FIG. 9 shows an example of a game field image G when a designation operation for part PB-1 is accepted. When a designation operation for part PB-1 is accepted, an image showing the face 61 of card 60S-1 placed in zone Z10 is displayed as part PC, as shown in FIG. 【0077】 Normally, a spectator cannot know the name or performance of the face-down card 60S-1, but in this embodiment, in response to the designation operation of the part PB-1, a part PC as shown in Fig. 9 is displayed, so the spectator can know the name and performance of the face-down card 60S-1. Note that instead of displaying an image showing the front 61 of the card 60S-1 as the part PC, a text message showing the name and performance of the card 60S-1 may be displayed as the part PC. 【0078】 Like part PB-1, part PB-2 is associated with a process for displaying information about card 60S-2 placed in zone Z12. Therefore, when a designation operation for part PB-2 is accepted, an image showing the face 61 of card 60S-2 is displayed as part PC. Since part PC is larger than part PB-2, the spectator can easily understand the name and performance of card 60S-2 placed in zone Z12 by referring to part PC. 【0079】 Note that part PA-1 may be associated with a process for displaying a list of cards 60S included in the card deck 600-1 placed in zone Z7. Then, in response to a designation operation for part PA-1, the list of cards 60S included in the card deck 600-1 may be displayed. In this way, the spectator may be able to grasp the list of cards 60S included in the card deck 600-1 placed in zone Z7. The same applies to parts PA-2 to PA-4. 【0080】 Furthermore, in the above description, it has been explained that the game field image G displayed on the display unit 55 of the display terminal device 50 changes (for example, from the state shown in FIG. 8 to the state shown in FIG. 9) in response to an operation performed on the display terminal device 50 by a spectator. However, the game field image G displayed on the display unit 55 of the display terminal device 50 may also change in response to an operation performed on the information processing device 40. For example, the part PC shown in FIG. 9 may be displayed in the game field image G in response to a designation operation performed using the operation unit 44 of the information processing device 40 by a representative who provides commentary or commentary on the card game. 【0081】 Furthermore, not only the game field image G but also the image captured by the camera device 30 may be displayed on the display unit 55 of the display terminal device 50. For example, both the game field image G and the image captured by the camera device 30 may be displayed on the display unit 55. Furthermore, for example, the image displayed on the display unit 55 may be switched between the game field image G and the image captured by the camera device 30 in response to a predetermined switching instruction. 【0082】 [1-3. Processing] The processing executed by the system 1 will be explained. 【0083】 [1-3-1] As will be described later, the information processing device 40 executes an identification process to identify the type and state of a card 60S placed on the game field F based on the reading results of the reading device 20. For this identification process, the card ID of the card 60 must be associated with the sleeve 70 that houses the card 60. Therefore, prior to starting a card game, an association process is executed to associate the card ID of the card 60 with the sleeve 70 that houses the card 60. 【0084】 [1-3-1-1] Figure 10 is a flow diagram showing an example of the association process. For example, a player places one card 60S from his / her deck vertically and face up in a predetermined zone Z (e.g., zone Z11) in the game field F. In this state, the association process shown in Figure 10 is executed. 【0085】 10, first, the control unit 41 of the information processing device 40 acquires an image captured by the photographing device 30 (S400). Then, the control unit 41 identifies the card ID of the card 60S shown in the captured image (i.e., the card ID of the card 60 placed in the above-mentioned zone Z while housed in the sleeve 70) from the captured image (S402). 【0086】 For example, the memory unit 42 pre-stores a trained model (a model for identifying the card ID of the card 60S shown in the photographed image) that has been generated by performing machine learning based on learning data including a photographed image of the game field F on which the card 60S is placed and the card ID (correct answer data) of the card 60S. Then, in step S402, the control unit 41 uses the trained model to identify the card ID of the card 60S shown in the photographed image. 【0087】 Note that storage unit 42 may be configured to previously store feature data that associates the card ID of card 60S with appearance feature information that indicates the appearance features of card 60S. Then, in step S402, control unit 41 may analyze the captured image to extract the appearance feature information of card 60S appearing in the captured image, and identify the card ID associated with the extracted appearance feature information (or appearance feature information that is most similar to the extracted appearance feature information) as the card ID of card 60S appearing in the captured image. 【0088】 After executing step S402, the control unit 41 acquires the tag ID read by the reading device 20 (S404). When the card 60S is placed in the zone Z, the tag ID stored in the IC tag 73 of the card 60S is read by the reading device 20 installed below the zone Z, and the read tag ID is supplied to the information processing device 40. The control unit 41 acquires the tag ID supplied in this manner. 【0089】 After executing step S404, the control unit 41 registers the association between the card ID identified in step S402 and the tag ID acquired in step S404 in the association data D1 (S406). 【0090】 11 shows an example of the association data D1 stored in the storage unit 42. The association data D1 includes a "card ID" and a "tag ID" field. The "card ID" field is a field for registering a card ID, and the "tag ID" field is a field for registering a tag ID. 【0091】 In step S406, the control unit 41 adds a new record to the association data D1 and registers the card ID identified in step S402 and the tag ID obtained in step S404 in the "card ID" and "tag ID" fields of the added record. 【0092】 After step S406 is executed, a completion notification is output, indicating that the association process is complete. For example, an image indicating the completion notification is displayed on the display unit 45, or a sound indicating the completion notification is output from the audio output unit 46. In response to the completion notification, the player removes the card 60S placed in zone Z and places the next card 60S from his or her deck in zone Z, vertically and face up. In this state, the association process shown in FIG. 10 is executed again. 【0093】 10 is executed for each card 60S included in the deck of the first player, whereby information on all cards 60S included in the deck of the first player is registered in the association data D1. Similarly, for each card 60S included in the deck of the second player, the association process shown in Fig. 10 is executed, whereby information on all cards 60S included in the deck of the second player is registered in the association data D1. 【0094】 [1-3-1-2] The association process is not limited to the process shown in Fig. 10. Fig. 12 is a flow diagram showing another example of the association process. Instead of the association process shown in Fig. 10, the association process shown in Fig. 12 may be executed. 【0095】 12 is based on the premise that an IC tag writer for writing information to the IC tag 73 is installed below the zone Z. In the following description, it is assumed that the reading device 20 installed below the zone Z is an IC tag reader / writer that has the functions of both an IC tag reader and an IC tag writer. 【0096】 12, first, control unit 41 of information processing device 40 acquires an image captured by photographing device 30 (S420). Then, control unit 41 identifies the card ID of card 60S shown in the captured image from the captured image (S422). The processes of steps S420 and S422 are the same as steps S400 and S402 in FIG. 【0097】 After executing step S422, the control unit 41 writes the card ID identified in step S422 to the IC tag 73 of the card 60S placed in the above-mentioned zone Z (S424). That is, the control unit 41 sends a write instruction for the card ID identified in step S422 to the reading device 20 placed under the above-mentioned zone Z. Then, in response to the write instruction, the reading device 20 writes the card ID identified in step S422 to the IC tag 73 of the card 60S placed in the above-mentioned zone Z. 【0098】 12 is executed for each card 60S included in the first player's deck, whereby the card ID of that card 60S is stored in the IC tag 73 of each card 60S included in the first player's deck. Similarly, for each card 60S included in the second player's deck, the association process shown in Fig. 12 is executed for each card 60S included in the second player's deck, whereby the card ID of that card 60S is stored in the IC tag 73 of each card 60S included in the second player's deck. In this case, the association between the card ID of the card 60 and the sleeve 70 containing that card 60 is not stored as association data D1 as shown in Fig. 11, but is stored in the IC tag 73 of each sleeve 70. 【0099】 [1-3-1-3] Here, it has been described that the association process is performed using the system 1, but it is not essential to perform the association process using the system 1. For example, an association system equipped with a photographing device and an IC tag reader (IC tag reader / writer) may be prepared separately from the system 1, and the association process may be performed using this system. Also, it is sufficient that the association is completed by the time the card game starts, and the timing for performing the association does not have to be immediately before the start of the card game. 【0100】 [1-3-2] During the play of a card game, the information processing device 40 executes a specification process to specify the type and state of the cards 60S placed on the game field F. Fig. 13 is a flow chart showing an example of the specification process. Note that the specification process shown in Fig. 13 is based on the premise that the association data D1 shown in Fig. 11 is stored in the storage unit 42. 【0101】 13, first, the control unit 41 of the information processing device 40 acquires an image captured by the photographing device 30 (S430). Then, the control unit 41 identifies the position and orientation of the card 60S placed on the game field F from the captured image (S432). 【0102】 In this embodiment, as shown in Fig. 14, for example, 35 areas A1 to A35 are set by dividing the captured image I into 5 vertically and 7 horizontally. Of these, areas A1 to A30 are set so as to correspond to zones Z1 to Z30 of the game field F. In the following, when it is not necessary to specify each of the areas A1 to A35, they will be collectively referred to simply as "area A." 【0103】 In step S432, the control unit 41 determines whether or not a card 60S is present in each area A of the captured image, and identifies the orientation (portrait / landscape orientation or front / back orientation) of the card 60S that is present. Here, "determining the portrait / landscape orientation of the card 60S" means determining whether the card 60S is placed portrait or landscape, and "determining the portrait / back orientation of the card 60S" means determining whether the card 60S is placed face up or face down. 【0104】 For example, the storage unit 42 pre-stores a trained model (a model for determining whether or not a card 60S is shown in each area A of the photographed image and the orientation of the card 60S) generated by performing machine learning based on training data including a photographed image of the game field F on which the card 60S is placed and correct answer data indicating the area A on which the card 60S is placed and the orientation of the card 60S. Then, in step S432, the control unit 41 uses the trained model to determine whether or not a card 60S is shown in each area A of the photographed image and the orientation of the card 60S shown. 【0105】 Note that data associating the orientation of the card 60S with appearance characteristic information indicating the appearance characteristics of the card 60S when placed in that orientation may be stored in advance in the storage unit 42. Then, in step S422, the control unit 41 may analyze the captured image to determine whether appearance characteristic information of the card 60S has been extracted from area A of the captured image, thereby specifying whether the card 60S appears in area A, and may specify the orientation of the card 60S appearing in area A from the extracted appearance characteristic information. 【0106】 The identification result in step S432 is registered in first identification result data D2. Fig. 15 shows an example of the first identification result data D2. As shown in Fig. 15, the first identification result data D2 includes fields for "area ID," "length / width flag," and "front / back flag." 【0107】 The "area ID" field indicates an area ID, which is information that uniquely identifies each area A set in the captured image. The "vertical / horizontal flag" field is a field for registering a vertical / horizontal flag that indicates the result of identifying the vertical / horizontal orientation of the card 60S shown in area A. For example, if the card 60S is identified as being vertically oriented, a value of "0" is registered in the "vertical / horizontal flag" field, and if the card 60S is identified as being horizontally oriented, a value of "1" is registered in the "vertical / horizontal flag" field. The "front / back flag" field is a field for registering a front / back flag that indicates the result of identifying the front / back orientation of the card 60S shown in area A. For example, if the card 60S is identified as being face up, a value of "0" is registered in the "front / back flag" field, and if the card 60S is identified as being face down, a value of "1" is registered in the "front / back flag" field. If the card 60S is not shown in area A, the "vertical / horizontal flag" and "front / back flag" fields are set to blank (Null). In the following, among the records of the first identification result data D2, a record in which "An" (n: natural number) is registered in the "area ID" field will be referred to as a "record with area ID "An"". 【0108】 For example, in the situation shown in Figure 7, in step S432, it is determined from the captured image that (a) a card 60S is depicted in each of areas A1, A7, A10, A12, A15, and A21, (b) the orientation of the card 60S depicted in area A10 is landscape and face down, (c) the orientation of the card 60S depicted in area A12 is portrait and face up, and (d) the orientation of the card 60S depicted in areas A1, A7, A15, and A21 is portrait and face down, and the determination results are registered in the first determination result data D2. 【0109】 After executing step S432, the control unit 41 acquires the reading result data of each reading device 20 supplied from the game board 10 (S434), and identifies the position and card ID of the card 60S placed on the game field F from the reading result data (S436). 【0110】 7, for example, reader 20-10 installed under zone Z10 reads the tag ID stored in IC tag 73 of card 60S-1 placed in zone Z10 and supplies the tag ID as read result data to information processing device 40. Then, control unit 41 refers to association data D1 to identify the card ID associated with the tag ID read by reader 20-10. In this way, the card ID of card 60S-1 placed in zone Z10 is identified. 【0111】 Similarly, reader 20-12 installed below zone Z12 reads the tag ID stored in IC tag 73 of card 60S-2 placed in zone Z12 and supplies the tag ID as read result data to information processing device 40. Then, control unit 41 refers to association data D1 and identifies the card ID associated with the tag ID read by reader 20-12. In this way, the card ID of card 60S-2 placed in zone Z12 is identified. 【0112】 Furthermore, the reader 20-7 installed below zone Z7 reads the tag IDs stored in the IC tags 73 of each card 60S included in the card stack 600-1 placed in zone Z7 and supplies these tag IDs as read result data to the information processing device 40. The control unit 41 then refers to the association data D1 to identify the card IDs associated with each tag ID read by the reader 20-7. In this way, the card IDs of each card 60S included in the card stack 600-1 placed in zone Z7 are identified. Card IDs are identified for zones Z1, Z15, and Z21 in the same manner as for zone Z7. 【0113】 The identification result in step S436 is registered in second identification result data D3. Fig. 16 shows an example of the second identification result data D3. As shown in Fig. 16, the second identification result data D3 includes fields for "reader ID" and "card ID." 【0114】 The "reader ID" field indicates the reader ID, which is information that uniquely identifies each reader 20. In FIG. 16, the reader ID of the reader 20-n (n: natural number) is written as "Rn." The "card ID" field is a field for registering the card ID identified from the reading result data of the reader 20. For a reader 20 that did not read the tag ID stored in the IC tag 73, the "card ID" field is set to blank (Null). Note that, hereinafter, among the records of the second identification result data D3, a record in which "Rn" (n: natural number) is registered in the "reader ID" field will be referred to as a "record of reader ID 'Rn'." 【0115】 7, for example, the card ID identified from the tag ID read by the reader 20-10 (i.e., the card ID of card 60S-1 placed in zone Z10) is registered in the "Card ID" field of the record with the reader ID "R10." Also, the card ID identified from the tag ID read by the reader 20-12 (i.e., the card ID of card 60S-2 placed in zone Z12) is registered in the "Card ID" field of the record with the reader ID "R12." 【0116】 Furthermore, a list of card IDs identified from the multiple tag IDs read by the reading device 20-7 (i.e., a list of card IDs of cards 60S included in the card stack 600-1 placed in zone Z7) is registered in the "Card ID" field of the record with the reading device ID "R7." The same is true for the "Card ID" fields of the records with the reading device IDs "R1," "R15," and "R21." Note that the "Card ID" fields of records other than those with the reading device IDs "R1," "R7," "R10," "R12," "R15," and "R21" are set to blank (Null). 【0117】 Note that, here, the explanation is based on the assumption that the association data D1 shown in FIG. 11 has been registered in the memory unit 42 by the association process shown in FIG. 10, but if the card ID of the card 60S has been registered in the IC tag 73 of the card 60S by the association process shown in FIG. 12, the process described below will be executed in step S436. 【0118】 7, for example, reader 20-10 installed below zone Z10 reads the card ID stored in IC tag 73 of card 60S placed in zone Z10 and supplies the card ID as read result data to information processing device 40. Then, control unit 41 registers the card ID read by reader 20-10 in the "card ID" field of the record for reader ID "R10." The same is true for zone Z12. 【0119】 Furthermore, reader 20-7 installed below zone Z7 reads the card IDs stored in the IC tags 73 of each card 60S included in card stack 600-1 placed in zone Z7, and supplies these card IDs as read result data to information processing device 40. Then, control unit 41 registers the multiple card IDs read by reader 20-7 in the "card ID" field of the record for reader ID "R7." The same applies to zones Z1, Z15, and Z21. 【0120】 After executing step S436, the control unit 41 generates game field situation data D4 based on the first identification result data D2 and the second identification result data D3 (S438). 【0121】 17 shows an example of the game field situation data D4. The game field situation data D4 is data that indicates the current situation of the game field F. More specifically, the game field situation data D4 is data that indicates the current situation of each zone Z within the game field F (whether or not a card 60S is placed in the zone Z, and the type and arrangement of the card 60S placed in the zone Z). 【0122】 As shown in FIG. 17, the game field situation data D4 includes "zone ID," "card ID," "vertical / horizontal flag," and "front / back flag" fields. The "zone ID" field indicates a zone ID, which is information that uniquely identifies each zone Z within the game field F. The "card ID" field is the same as the "card ID" field in the second identification result data D3. The "vertical / horizontal flag" and "front / back flag" fields are the same as the "vertical / horizontal flag" and "front / back flag" fields in the first identification result data D2. Note that, hereinafter, among the records in the game field situation data D4, a record in which "Zn" (n: natural number) is registered in the "zone ID" field will be referred to as a "record with zone ID 'Zn'." 【0123】 In step S438, the control unit 41 compares the “area ID” field of the first identification result data D2 with the “reading device ID” field of the second identification result data D3, and generates game field situation data D4 by combining the first identification result data D2 and the second identification result data D3. 【0124】 For example, the record with the reader ID "R1" among the records in the second identification result data D3 and the record with the area ID "A1" among the records in the first identification result data D2 are both records related to the reader 20-1 or area A1 corresponding to zone Z1, and these records correspond to each other. Therefore, the control unit 41 registers in the game field situation data D4 a combination of the card ID registered in the "Card ID" field of the record with the reader ID "R1" among the records in the second identification result data D3 and the length / width flag and the front / back flag registered in the "Vertical / Horizontal Flag" and "Front / Back Flag" fields of the record with the area ID "A1" that corresponds to the reader ID "R1" among the records in the first identification result data D2, as information indicating the current situation of zone Z1. That is, the control unit 41 registers this combination in the "Card ID," "Vertical / Horizontal Flag," and "Front / Back Flag" fields of the record with the zone ID "Z1" among the records in the game field situation data D4. The same applies to zones Z2 to Z30. 【0125】 [1-3-3] During the play of a card game, a display control process is executed to display a game field image G on the display unit 55 of the display terminal device 50. For example, the memory unit 42 stores card data that associates a card ID with information and an image (front side 61) of a card 60, and the game field image G is displayed based on this card data and game field situation data D4. Figure 18 shows an example of the display control process. 【0126】 18, the control unit 41 of the information processing device 40 transmits data regarding the game field image G to the display terminal device 50 via the communication unit 43 (S440), and the display terminal device 50 receives the data via the communication unit 53 (S500). Then, the control unit 51 of the display terminal device 50 causes the display unit 55 to display the game field image G based on the data (S502). 【0127】 Here, "data related to the game field image G" refers to data necessary for displaying the game field image G on the display terminal device 50 (display unit 55). For example, card data and game field situation data D4 correspond to examples of "data related to the game field image G". The card data may be stored in advance in the storage unit 52 of the display terminal device 50, in which case there is no need to transmit the card data to the display terminal device 50. Note that the game field image G itself may be transmitted to the display terminal device 50 as "data related to the game field image G". 【0128】 When generating the game field image G, it is determined whether the face-up / face-down flag of the card 60S registered in the game field situation data D4 is "1" (in other words, whether the card 60S identified in step S432 is facing down). Then, depending on the result of this determination, a part representing the card 60S is displayed in the game field image G. 【0129】 For example, if the front / back flag of the card 60S is not "1" (in other words, if the card 60S identified in step S432 is facing up and not down), an image showing the front 61 of the card 60S, such as part PB-2 shown in FIG. 7, is displayed as a part representing the card 60S in the game field image G. That is, an image corresponding to the card ID of the card 60S registered in the game field situation data D4 (in other words, an image corresponding to the type of the card 60S identified in step S432) is displayed as a part representing the card 60S. 【0130】 On the other hand, if the front / back flag of the card 60S is "1" (i.e., the card 60S identified in step S432 is facing down), an image showing the back side 62 of the card 60S, such as part PB-1 shown in FIG. 7, is displayed as a part representing the card 60S in the game field image G. That is, an image that is not based on the card ID of the card 60S registered in the game field situation data D4 (in other words, an image that is not based on the type of the card 60S identified in step S432) is displayed as a part representing the card 60S. 【0131】 The game field image G may be displayed on the display unit 45 of the information processing device 40. That is, the control unit 41 of the information processing device 40 may cause the display unit 45 to display the game field image G based on the game field situation data D4. 【0132】 [1-3-4] FIG. 19 shows an example of processing that is repeatedly executed by the display terminal device 50 while the game field image G is being displayed. 【0133】 19, the control unit 51 of the display terminal device 50 determines whether or not a card designation operation has been received (S510). A "card designation operation" is an operation for designating a card 60S displayed in a game field image G. For example, in the case of the game field image G shown in FIG. 8, an operation for designating part PB-1 or PB-2 (for example, a tap operation on part PB-1 or PB-2) corresponds to a "card designation operation." 【0134】 If it is determined that a card designation operation has been received (S510: Yes), the control unit 51 displays a card image of the designated card 60S (S512). For example, the part PC shown in FIG. 9 corresponds to the "card image." For example, when the game field image G shown in FIG. 8 is displayed on the display unit 55 and a designation operation is performed for the part PB-1 corresponding to the card 60S-1 placed in zone Z10, the control unit 51 displays the part PC showing the face 61 of the card 60S-1 placed in zone Z10. 【0135】 Although not shown in FIG. 19, when a predetermined deletion instruction operation (for example, a designation operation for designating the part PC) is performed while the part PC is displayed, the control unit 51 deletes the part PC. 【0136】 In addition, when the display terminal device 50 accepts a card designation operation, a notification that the card designation operation has been accepted may be sent from the display terminal device 50 to the information processing device 40, and the control unit 41 of the information processing device 40 may generate a game field image G as shown in FIG. 9 and return it to the display terminal device 50, thereby causing the game field image G to be displayed on the display terminal device 50. 【0137】 19 is executed by the control unit 41 of the information processing device 40. When the game field image G is displayed on the display unit 45 of the information processing device 40, the control unit 41 of the information processing device 40 executes the process shown in FIG. 【0138】 [1-4. Effects] According to the first embodiment described above, the type and state (position, orientation, etc.) of the card 60S placed on the game field F can be identified using not only the image captured by the photographing device 30 that photographs the game field F, but also the reading results of the reading device 20 that reads the information stored in the IC tag 73 of the card 60S. According to the first embodiment, matters that cannot be identified (or are difficult to identify) from the image captured by the photographing device 30 can be identified based on the reading results of the reading device 20. 【0139】 For example, even if the card 60S is placed face down on the game field F (i.e., if the card 60S is placed with its surface 61 not visible in the image captured by the photographing device 30), the type of the card 60S and the information (such as name and performance) written on the surface 61 of the card 60S can be identified based on the reading result of the reading device 20. Furthermore, even if the card 60S is holographically processed, for example, the type of the card 60S and the information (such as name and performance) written on the surface 61 of the card 60S can be identified based on the reading result of the reading device 20. Furthermore, even if multiple cards 60S are placed stacked, for example, the types of these multiple cards 60S can be identified based on the reading result of the reading device 20. 【0140】 Furthermore, in the first embodiment, the identification result (first identification result) from the image captured by the photographing device 30 includes identification results regarding the position and orientation of the card 60S, and the identification result (second identification result) from the reading result by the reading device 20 includes identification results regarding the position and type of the card 60S. Therefore, the identification result regarding the position of the card 60S (position identification result) is included in both the first identification result and the second identification result. Therefore, even if multiple cards 60S are placed on the game field F, by comparing the position identification results included in both the first identification result and the second identification result, it is possible to identify the combination of the first identification result and the second identification result for the same card 60S. In other words, even if multiple cards 60S are placed on the game field F, it is possible to identify the combination of the type, position, and orientation for each individual card 60S. 【0141】 In addition, in the first embodiment, since the IC tag 73 is provided on the sleeve 70, even if the card 60 itself does not have an IC tag, by storing the card 60 in the sleeve 70 and using it, it becomes possible to identify the type and condition of the card 60 from the reading results of the reading device 20. 【0142】 That is, since the card 60 itself does not need to have an IC tag, it becomes possible to use, for example, an existing card 60 that does not have an IC tag. 【0143】 Furthermore, if the card 60 itself is equipped with an IC tag, if the IC tag of the card 60 breaks down, the card 60 will become unusable, which may cause dissatisfaction to the player. Some cards 60 are rare, and if such rare cards 60 become unusable due to a malfunction of the IC tag, the player may become very dissatisfied. In this regard, if the sleeve 70 is equipped with the IC tag 73, even if the IC tag 73 breaks down, the card 60 can continue to be used by replacing the sleeve 70. 【0144】 In addition, in the first embodiment, since the IC tag 73 is provided on the back surface 72 of the sleeve 70, it is possible to prevent the front surface 61 of the card 60 accommodated in the sleeve 70 from being hidden by the IC tag 73 and becoming difficult to see. 【0145】 Furthermore, in the first embodiment, the appearance of the back surface 72 of each sleeve 70 is the same for all sleeves 70, so that it is possible to ensure that the individual sleeves 70 cannot be distinguished from each other based on the appearance of the back surface 72. 【0146】 Furthermore, in the first embodiment, since the game field image G is displayed on the display terminal device 50, spectators (people viewing the display terminal device 50) can easily grasp the current situation of the game field F. 【0147】 Furthermore, in the first embodiment, even when the card 60S is placed face down on the game field F (i.e., when the card 60S is placed with the face 61 not visible), the part PC representing the face 61 of the card 60S is displayed in the game field image G, so the spectator can learn information (such as the name and performance) written on the face 61 of the card 60S that would normally be inaccessible, providing a new level of interest. As a result, the interest of the spectator when watching a card game can be increased. 【0148】 In the first embodiment, when a designation operation to designate a card 60S placed face down (for example, a designation operation to designate part PB-1 in FIG. 8) is received, part PC showing the front 61 of the card 60S is displayed. Therefore, for example, information (such as name and performance) of the card 60S placed face down cannot be known in principle, and can be known only when the spectator wishes by performing the designation operation. 【0149】 [1-5. Modifications] Modifications of the first embodiment will now be described. 【0150】 [1-5-1] In the embodiment described above, the sleeve 70 is equipped with an IC tag 73, but instead of the sleeve 70 being equipped with an IC tag 73, an object equipped with an IC tag 73 and a card 60 may be housed in the sleeve 70. 【0151】 For example, as shown in FIG. 20 , an object 80 accommodated in a sleeve 70 together with a card 60 may include an IC tag 73. The object 80 is formed of a material that does not interfere with the transmission and reception of signals between the IC tag 73 and the reader 20. For example, the object 80 is a sheet-like object having a shape similar to that of the card 60. In the example shown in FIG. 20 , the shape and size of the object 80 are the same as (or approximately the same as) the card 60, but the shape and size of the object 80 may be different from those of the card 60. The IC tag 73 may be attached to either side of the object 80. 【0152】 The card 60 is placed in the sleeve 70 with the front surface 61 of the card 60 facing the front surface 71 of the sleeve 70, and the object 80 is placed between the back surface 62 of the card 60 and the back surface 72 of the sleeve 70. When used in a card game, both the card 60 and the object 80 are placed in the sleeve 70. Note that it is sufficient that both the card 60 and the object 80 are placed in the sleeve 70 when used in a card game, and when placing the card 60 in the sleeve 70, it is not necessary to place the card 60 and the object 80 together in the sleeve 70 at the same time. The card 60 may be placed in the sleeve 70 after the object 80 is placed in the sleeve 70, or the object 80 may be placed in the sleeve 70 after the card 60 is placed in the sleeve 70. The card 60 and the object 80 may be placed in the sleeve 70 together at the same time. 【0153】 Even if the object 80 described above is stored in the sleeve 70 together with the card 60, it is possible to identify from the reading results of the reading device 20 matters that cannot be identified (or are difficult to identify) from the image captured by the photographing device 30, just as in the case where the IC tag 73 is attached to the sleeve 70. Furthermore, even if the card 60 itself does not have an IC tag, by storing the card 60 in the sleeve 70 together with the object 80, it is possible to identify the type and condition of the card 60 from the reading results of the reading device 20. 【0154】 [1-5-2] The card 60 itself (for example, the back surface 62) may be provided with an IC tag 73. Even in this case, it becomes possible to identify matters that cannot be identified (or are difficult to identify) from the image captured by the photographing device 30 based on the reading result of the reading device 20. 【0155】 [1-5-3] Before the start of a card game, when a player's deck is placed in zone Z7 or Z21 as a deck of cards, the specific process shown in Fig. 13 may be executed to determine whether the player's deck placed in zone Z7 or Z21 complies with the rules based on the game field state data D4. If the deck does not comply with the rules, a warning may be output. 【0156】 [1-5-4] In the above, it has been explained that information stored in the IC tag 73 of card 60S placed in zone Z cannot be read by a reader 20 installed under another zone Z. However, if the information stored in the IC tag 73 of card 60S is read by multiple readers 20, the reader 20 that receives the strongest signal from the IC tag 73 may be regarded as the reader 20 that read the information stored in the IC tag 73. For example, if the information stored in the IC tag 73 of card 60S is read by readers 20-9 and 20-10, and the received signal strength of reader 20-10 is stronger than that of reader 20-9, card 60S may be identified as being placed in zone Z10. 【0157】 [1-5-5] In the embodiment described above, the reading devices 20-1 to 20-30 are installed at multiple positions corresponding to the zones Z1 to Z30, respectively. However, instead of this, the reading devices 20 equipped with antennas arranged in a grid pattern may be installed inside the housing 11 of the game board 10. 【0158】 21, the reader 20 may have a plurality of first antennas 21 extending in a first direction (e.g., vertical direction) arranged at predetermined intervals, and a plurality of second antennas 22 extending in a second direction (e.g., horizontal direction) arranged at predetermined intervals. In this case, the location of the card 60S can be identified by identifying the combination of the first antenna 21 and the second antenna 22 that received the signal from the IC tag 73 (in other words, the combination of the first antenna 21 and the second antenna 22 that received the strongest signal from the IC tag 73). For example, the intersection of the first antenna 21 and the second antenna 22 that received the signal from the IC tag 73 (in other words, the first antenna 21 and the second antenna 22 that received the strongest signal) can be identified as the location of the card 60S. 【0159】 [1-5-6] In the above, it has been explained that the sleeve 70 is provided (sold, etc.) separately from the card 60, but the sleeve 70 may be provided together with the card 60. In this case, the sleeve 70 may be provided with the card ID stored in the IC tag 73 (IC chip). 【0160】 [1-5-7] The card game played by the player is not limited to the card game described above. For example, the positions and number of zones Z set within the game field F are not limited to the example shown in FIG. 3. Also, depending on the card game, the area where the card 60 is placed, such as zones Z1 to Z30, may not be limited, and the player may be able to place the card 60 at any position within the game field F. Note that according to the modified example shown in FIG. 21, even if the player places the card 60 at any position within the game field F, the position where the card 60 is placed can be identified. 【0161】 [1-5-8] The game played by the player may be a game played using game media other than the cards 60. For example, the game played by the player may be a game played using game media such as figures, pieces, or tiles, or game media shaped like go stones. 【0162】 [1-6. Functional Elements] The following describes the functional elements included in the system 1. Figure 22 is a functional block diagram for explaining the functional elements included in the system 1. 【0163】 [1-6-1] The system 1 is a system related to a game played using an object 100 placed on an object surface, and includes functional elements related to the game. 【0164】 A "game played using an object 100 placed on the object surface" is, for example, a game that progresses by placing the object 100 on the object surface, and more specifically, a game in which the type or state (position or orientation, etc.) of the object 100 placed on the object surface affects the progress or outcome of the game (win or loss, success or failure, score, etc.). For example, a game in which two players compete against each other by placing play media on a game field is an example of the above-mentioned "game." For example, the card game described above in which two players compete against each other by placing cards 60 on the game field F is an example of a "game played using an object 100 placed on the object surface." 【0165】 The "game" is not limited to a game between two players, but may be a game between three or more players, or a game played by a single player. The "game" may also be a game in which two or more players cooperate to achieve an objective. 【0166】 The "target surface" is a surface in the real world on which the target object 100 is placed. For example, the "target surface" is called a "game field" or a "play field." The "target surface" may be a flat surface, or may be an uneven surface or a curved surface as long as the target object 100 can be placed thereon. 【0167】 The object 100 is a real object to be placed on a target surface and is an object to be used in a game. For example, the object 100 is an object in which a play medium is housed in a container. That is, the object 100 is the play medium housed in the container. In other words, the object 100 is a container in which the play medium is housed. Also, for example, the object 100 may be the play medium itself (the play medium alone). 【0168】 The "playing medium" is, for example, a card, a figure, a piece, a tile, etc. The "playing medium" may also be an object having a shape such as a go stone. 【0169】 A "container" is an object capable of containing individual game media. In other words, a "container" is an object into which game media can be inserted. A "container" is used to protect game media. A "container" is configured to be at least partially transparent, so that at least the externally distinctive parts of the contained game media (parts with external characteristics that distinguish it from other game media) can be seen from outside the container. For example, a "container" is a bag-shaped object and is called a "sleeve" or the like. 【0170】 For example, the object 100 includes a writing surface, which is a surface on which information is written. A "writing surface" is a surface on which information about the object 100 is written. For example, information according to the type of object 100 is written on the writing surface. In other words, information specific to the type of object 100 is written on the writing surface. For example, text or a pattern specific to the type of object 100 is written on the writing surface. The information written on the writing surface can also be said to be information that can be identified from the type of object 100. 【0171】 For example, if the object 100 is a game medium contained in a container (or a game medium by itself), information about the game medium contained in the container is written on the writing surface. For example, if the object 100 is a card contained in a sleeve (or a card by itself), the name, attributes, details of the effect on the progress or outcome of the game, or the design of the card is written on the writing surface. 【0172】 Furthermore, the "written surface" is a surface that, if this surface appears in a photographed image, allows the type of object 100 to be identified from the photographed image. In other words, the "written surface" is a surface on which content that allows the type of object 100 to be identified is written. 【0173】 The information written on the "writing surface" is not limited to information about the object 100, but may also be information about the game. 【0174】 Furthermore, for example, the object 100 includes a first surface and a second surface separate from the first surface. For example, the second surface is a surface on the opposite side of the first surface. The angle between the normal direction of the outer surface of the first surface and the normal direction of the outer surface of the second surface is 180 degrees or approximately 180 degrees. The first surface and the second surface have a relationship such that when the object 100 is placed on the object surface so that the outer surface of the second surface is in contact with the object surface, the outer surface of the first surface is facing upward, and when the object 100 is placed on the object surface so that the outer surface of the second surface is in contact with the object surface, the outer surface of the first surface is facing upward. 【0175】 When the target object 100 is an object in which a play medium is housed in a container, the container includes a first surface and a second surface, and the play medium includes a writing surface. When the play medium is not housed in the container, the inner surface of the first surface faces the inner surface of the second surface, and when the play medium is housed in the container, the first surface (the inner surface of the first surface) faces the writing surface of the play object. For example, all or part of the first surface is formed using a transparent material (such as a transparent film), and the first surface is configured so that the writing surface of the play object housed in the container can be seen through the first surface from outside the container. When the play medium is a card, when the card is housed in the container, the inner surface of the first surface faces the first surface of the card (e.g., the front surface / writing surface), and the inner surface of the second surface faces the second surface of the card (e.g., the back surface). 【0176】 22, the object 100 includes a holding unit 101. The holding unit 101 is for holding specific information as described below. For example, the holding unit 101 is provided on a surface different from the above-mentioned writing surface. In other words, the object 100 includes the above-mentioned writing surface and a holding surface that is the surface on which the holding unit 101 is provided. 【0177】 For example, the identification information is information for identifying the type or state of the object 100 placed on the object surface. That is, the identification information is information that serves as a basis for identifying at least one of the type and state of the object 100 placed on the object surface. In other words, the identification information includes at least one of information that serves as a basis for identifying the type of the object 100 and information that serves as a basis for identifying the state of the object 100. Note that the "information that serves as a basis for identifying the type of the object 100" may be information that indicates the type of the object 100 itself (in other words, information that identifies the type of the object 100). Furthermore, the "information that serves as a basis for identifying the state of the object 100" may be information that indicates the state of the object 100 itself. 【0178】 If the object 100 is a game medium contained in a container (or a game medium alone), the identification information is information for identifying the type or state of the game medium (or the game medium alone placed on the object surface) contained in the container. In other words, the identification information includes at least one of information that serves as the basis for identifying the type of game medium (or the game medium alone) contained in the container and information that serves as the basis for identifying the state of the game medium (or the game medium alone) contained in the container. 【0179】 If there is data associating a container ID, which is identification information that uniquely identifies a container, with a game medium ID, which is identification information that uniquely identifies the type of game medium contained in the container, and if the type of game medium contained in the container can be identified based on the container ID, the container ID is an example of "basic information for identifying the type of game medium contained in the container." Note that identification information that uniquely identifies the holder 101 can be used as the container ID. For example, if the holder 101 is an IC tag, a tag ID, which is identification information that uniquely identifies each IC tag, can be used as the container ID. 【0180】 Furthermore, information indicating the type of game medium contained in the container (in other words, information that identifies the type of game medium) can also be an example of "basic information for identifying the type of game medium contained in the container." Specifically, a game medium ID, which is identification information that uniquely identifies the type of game medium, can also be an example of "basic information for identifying the type of game medium contained in the container." 【0181】 Furthermore, for example, the specific information is information for identifying information written on the writing surface of the object 100 placed on the object surface. In other words, the specific information is information that serves as a basis for identifying information written on the writing surface of the object 100 placed on the object surface. For example, if the information written on the writing surface is information related to the type of the object 100, and if the type of the object 100 is identified, the information that serves as a basis for identifying the type of the object corresponds to "information that serves as a basis for identifying information written on the writing surface of the object 100." 【0182】 In the card game described above, the game field F (in other words, the mat 12) corresponds to an example of an "object surface." Furthermore, the card 60 corresponds to an example of a "play medium," and the sleeve 70 corresponds to an example of a "container." Furthermore, the card 60S, which is a sleeve equipped with an IC tag 73 and a card 60 contained therein, corresponds to an example of an object 100. Furthermore, the front surface 71 and the back surface 72 of the sleeve 70 correspond to an example of a "first surface" and a "second surface," respectively. Furthermore, the front surface 61 of the card 60S corresponds to an example of a "writing surface," and the inner surface of the back surface 72 of the sleeve 70 corresponds to an example of a "holding surface." 【0183】 Furthermore, the IC tag 73 of the card 60S corresponds to an example of the holding unit 101. The tag ID corresponds to an example of "specific information held in the holding unit 101" (basic information for identifying the type of play medium contained in the container). When the association process shown in FIG. 12 is executed, the card ID written to the IC tag 73 corresponds to an example of "specific information held in the holding unit 101" (basic information for identifying the type of play medium contained in the container). 【0184】 20, the card 60S, in which the object 80 equipped with the IC tag 73 and the card 60 are housed in the sleeve 70, corresponds to an example of the target object 100, and the IC tag 73 equipped on the object 80 corresponds to an example of the holder 101. In addition, in the case of the modified example in which the card 60 itself is equipped with the IC tag 73, the card 60 alone corresponds to an example of the target object 100, and the IC tag 73 equipped on the card 60 corresponds to an example of the holder 101. 【0185】 [1-6-2] The system 1 includes a photographing unit 110, a photographed image acquisition unit 120, a reading unit 130, a reading result acquisition unit 140, an identification unit 150, and a display control unit 160 as functional elements for identifying the type and state of the object 100 placed on the object surface, and for displaying information related to the object 100 placed on the object surface on the display unit 170. 【0186】 [1-6-3] The photographing unit 110 photographs the target surface on which the object 100 is placed. For example, the photographing unit 110 photographs the target surface from above the target surface. The photographing unit 110 may be capable of photographing the entire target surface, or may be capable of photographing only an area of ​​the target surface where the object 100 may be placed. In this embodiment, the photographing device 30 corresponds to the photographing unit 110. 【0187】 [1-6-4] The reading unit 130 reads information held in the holder 101 of the target object 100 placed on the target surface. 【0188】 The object 100 includes a writing surface on which information is written and a holding surface which is a surface equipped with a holding part 101, and the reading part 130 is capable of reading the information held in the holding part 101 of the holding surface of the object placed on the object surface with the writing surface facing the object surface. 【0189】 For example, the holder 101 is an IC tag, and the reader 130 reads information stored in the IC tag. That is, the reader 130 includes one or more IC tag readers. For example, the reader 130 includes multiple IC tag readers installed at multiple positions corresponding to multiple positions on the target surface. Also, for example, the reader 130 includes an IC tag reader equipped with an antenna arranged to pass through multiple positions on the target surface. In other words, the reader 130 is an antenna that receives a signal transmitted from an IC tag, and includes multiple antennas installed to correspond to multiple positions on the target surface, respectively, and reads information stored in the IC tag provided on the target object 100. In this embodiment, the reader 130 corresponds to readers 20-1 to 20-30 installed to correspond to multiple zones Z1 to Z30 of the game field F, respectively. In the modified example shown in Figure 21, the reading unit 130 corresponds to a reading device 20 equipped with antennas (first antenna 21 and second antenna 22) arranged to pass through multiple positions corresponding to multiple positions on the game field F. 【0190】 In the example of the card game mentioned above, the IC tag 73 of the sleeve 70 corresponds to an example of the holding portion 101, the front surface 61 of the card 60 stored in the sleeve 70 corresponds to an example of the "writing surface," and the inner surface of the back surface 72 of the sleeve 70 corresponds to an example of the "holding surface." 【0191】 In the case of the card game example described above, the reading unit 130 reads the tag ID (an example of information for identifying the holding unit 101) stored in the IC tag 73 of the card 60S placed on the game field F. 【0192】 When the association process shown in Figure 12 is executed, the card ID of the card 60S (an example of information that identifies the type of object 100) is stored in the IC tag 73 of the card 60S, so the reading unit 130 reads the card ID stored in the IC tag 73 of the card 60S placed on the game field F. 【0193】 [1-6-5] The captured image acquisition unit 120 acquires the captured image by the photographing unit 110. The reading result acquisition unit 140 acquires the reading result by the reading unit 130. The identification unit 150 identifies the type and state of the object 100 placed on the target surface based on the captured image by the photographing unit 110 and the reading result by the reading unit 130. For example, the captured image acquisition unit 120, the reading result acquisition unit 140, and the identification unit 150 are realized by the control unit 41 of the information processing device 40. 【0194】 "Identifying the type of object 100" means identifying which of multiple types of objects 100 the object 100 placed on the object surface is. In other words, one or more of the multiple types of objects 100 can be placed on the object surface, and identifying which of the multiple types of objects 100 at least one of the objects 100 placed on the object surface is corresponds to "identifying the type of object 100." For example, each object 100 is assigned identification information that identifies the type of object 100, and identifying the identification information of the object 100 placed on the object surface corresponds to "identifying the type of object 100." Note that, if the object 100 is a play medium contained in a container, identifying the type (identification information) of the play medium contained in the container corresponds to "identifying the type of object 100." 【0195】 "Determining the state of the object 100" includes, for example, determining the position of the object 100 placed on the object surface. 【0196】 Furthermore, "determining the state of the object 100" includes, for example, determining how the object 100 is placed on the object surface (arrangement format). Specifically, determining the orientation of the object 100 placed on the object surface corresponds to an example of "determining the state of the object 100." Note that the "orientation" of the object 100 refers to the direction in which the reference direction of the object 100 faces. 【0197】 For example, if the object 100 is a rectangular object, the long side direction of the object 100 is an example of a "reference direction." In this case, determining in which direction the long side direction of the object 100 faces is an example of "determining the orientation of the object 100." For example, determining whether the object 100 is placed with its long side facing a first direction or with its long side facing a second direction is an example of "determining the orientation of the object 100." More specifically, determining whether the object 100 is placed in a portrait orientation (appearing to be vertically elongated from a specific viewpoint (such as the player or the camera unit 110)) or in a landscape orientation (appearing to be horizontally elongated from a specific viewpoint) is an example of "determining the orientation of the object 100." 【0198】 Also, for example, the normal direction of a specific surface (such as the front surface) of the object 100 corresponds to an example of a "reference direction." In this case, determining in which direction the normal direction of a specific surface (such as the front surface) of a card faces corresponds to an example of "determining the orientation of the object 100." For example, determining whether the object 100 is placed with the normal direction facing a first direction or with the normal direction facing a second direction corresponds to an example of "determining the orientation of the object 100." More specifically, determining whether the object 100 is placed with the front surface facing up (a state in which the front surface is visible from a specific viewpoint) or with the back surface facing up (a state in which the back surface is visible from a specific viewpoint: an upside-down state) corresponds to an example of "determining the orientation of the object 100." 【0199】 For example, if the object 100 is a figure housed in a container or a stand-alone figure, the front direction of the figure is an example of the “reference direction.” In this case, identifying the direction in which the front direction of the figure faces is an example of “identifying the orientation of the object 100.” 【0200】 In addition, when the object 100 is a play medium contained in a container, identifying the state of the play medium contained in the container corresponds to "identifying the state of the object 100." 【0201】 Furthermore, the "state of the object 100" identified by the identification unit 150 is an item that affects the progress or outcome of the game, among the items that can be included in the phrase "state of the object 100." In other words, the "state of the object 100" identified by the identification unit 150 is an item that has meaning in terms of the progress of the game, or an item that is important to the viewer of the display unit 170, among the items that can be included in the phrase "state of the object 100." 【0202】 For example, the identification unit 150 identifies some of the items related to the type and condition of the object 100 placed on the target surface based on the image captured by the photographing unit 110, and identifies other items based on the reading results of the reading unit 130. 【0203】 [1-6-6] As shown in FIG. 22, the identification unit 150 includes a first identification unit 151 and a second identification unit 152. 【0204】 [1-6-6-1] The first identification unit 151 identifies the position of the object 100 placed on the object surface based on the image captured by the imaging unit 110. The first identification unit 151 also identifies the orientation of the object 100 placed on the object surface based on the image captured by the imaging unit 110. 【0205】 For example, the first identification unit 151 identifies the position and orientation of the object 100 placed on the object surface by identifying the position and orientation of the object 100 appearing in the captured image using a trained model (a model for identifying the position and orientation of the object 100 appearing in the captured image) generated by performing machine learning based on training data including captured image data of the object surface on which the object 100 is placed and correct answer data indicating the position and orientation of the object 100. 【0206】 Furthermore, for example, the first identification unit 151 may identify the position and orientation of the object 100 placed on the object surface by detecting the object 100 from the image captured by the imaging unit 110 using image analysis processing. That is, the first identification unit 151 may identify the position and orientation of the object 100 placed on the object surface by detecting the object 100 from the captured image based on feature information about the appearance of the object 100, thereby identifying the position and orientation of the object 100 appearing in the captured image. 【0207】 In the example of the card game described above, the first identification unit 151 identifies the position of the card 60S based on the image captured by the photographing device 30. The first identification unit 151 also identifies the vertical and horizontal orientation of the card 60S based on the image captured by the photographing device 30. The first identification unit 151 also identifies the front and back orientation of the card 60S based on the image captured by the photographing device 30. 【0208】 [1-6-6-2] The second identification unit 152 identifies the position of the object 100 placed on the object surface based on the reading result of the reading unit 130. The second identification unit 152 also identifies the type of the object 100 placed on the object surface based on the reading result of the reading unit 130. The second identification unit 152 also identifies information written on the writing surface of the object 100 placed on the object surface based on the reading result of the reading unit 130. For example, the second identification unit 152 identifies information written on the writing surface of the object 100 placed on the object surface based on the identification result of the type of the object 100 placed on the object surface. 【0209】 The "reading result of the reading unit 130" is information read by the reading unit 130. The "reading result of the reading unit 130" may also be information indicating whether or not the information stored in the storage unit 101 was able to be read. 【0210】 When the holder 101 is an IC tag and the reader 130 is an antenna that receives a signal transmitted from the IC tag and includes multiple antennas installed corresponding to multiple positions on the target surface, the "reading result of the reader 130" may be information indicating which of the multiple antennas received the signal transmitted from the IC tag of the object placed on the target surface. For example, when the reader 130 includes multiple IC tag readers installed at multiple positions corresponding to multiple positions on the target surface, the "reading result of the reading means" may be information indicating which of the multiple IC readers read the information stored in the IC tag. Also, for example, when the reader 130 includes an IC tag reader with an antenna arranged to pass through multiple positions on the target surface, the "reading result of the reading means" may be information indicating which part of the antenna received the signal from the IC tag. 【0211】 In the case of the card game example described above, the information read by the reading device 20 (the information stored in the IC tag 73) corresponds to an example of the "reading result of the reading unit 130." Information indicating whether the reading device 20 has read the information stored in the IC tag 73 also corresponds to an example of the "reading result of the reading unit 130." Information indicating which of the multiple reading devices 20-1 to 20-30 read the information stored in the IC tag 73 (in other words, which of the multiple reading devices 20-1 to 20-30 received the signal from the IC tag 73) also corresponds to an example of the "reading result of the reading unit 130." Note that in the case of the modified example shown in FIG. 21, information indicating which of the first antenna 21 and second antenna 22 received the signal from the IC tag 73 corresponds to an example of the "reading result of the reading unit 130." 【0212】 In the case of the card game example described above, the second identification unit 152 identifies the position and type of the card 60S placed on the game field F based on the reading result of the reading device 20. 【0213】 For example, the second identification unit 152 identifies the position of the card 60S based on which reader 20 read the information stored in the IC tag 73 of the card 60S. That is, the second identification unit 152 identifies the position on the game field F corresponding to the position of the reader 20 that read the information stored in the IC tag 73 of the card 60S (the reader 20 that received the signal transmitted from the IC tag 73 of the card 60S) as the position of the card 60S. For example, if the information stored in the IC tag 73 of the card 60S was read by the reader 20-10, the second identification unit 152 identifies the zone Z10 associated with the reader 20-10 as the zone Z where the card 60S was placed. 【0214】 21 , the second identification unit 152 may identify the position of the card 60S based on which part of the antenna received the signal from the IC tag 73 of the card 60S. That is, the second identification unit 152 may identify, as the position of the card 60S, a position on the game field F corresponding to the part of the antenna where the signal from the IC tag 73 of the card 60S was received. For example, the second identification unit 152 may identify, as the zone Z where the card 60S was placed, a zone Z including the intersection of the first antenna 21 and the second antenna 22 that received the signal from the IC tag 73 of the card 60S (in other words, the first antenna 21 and the second antenna 22 with the strongest received signal strength). 【0215】 Furthermore, the second identification unit 152 identifies the type of the card 60S placed on the game field F based on the information read by the reader 20. 【0216】 For example, when the association process shown in Fig. 10 is executed, association data D1 (Fig. 11) that associates the tag ID with the card ID is stored in the storage unit 42. In this case, the second identification unit 152 identifies the card ID associated with the tag ID read by the reading device 20 based on the association data D1. 【0217】 12 is executed, the card ID of the card 60S is stored in the IC tag 73 of the card 60S, and the card ID is read by the reading unit 130. In this case, the second identification unit 152 acquires the card ID read by the reading device 20. 【0218】 [1-6-6-3] There may be multiple objects 100 placed on the target surface. In this case, for each of the multiple objects 100, an identification result from the first identification unit 151 based on the image captured by the imaging unit 110 will be obtained. Similarly, for each of the multiple objects 100, an identification result from the second identification unit 152 based on the reading result from the reading unit 130 will also be obtained. In such a case, it is necessary to identify a combination of the identification result from the first identification unit 151 and the identification result from the second identification unit 152 for the same object 100 placed on the target surface. 【0219】 In this regard, the identification results of the first identification unit 151 and the identification results of the second identification unit 152 commonly include identification results regarding specified items of the object 100, and the identification unit 150 identifies a combination of the identification results of the first identification unit 151 and the identification results of the second identification unit 152 regarding the same object 100 placed on the object surface by comparing the identification results regarding the specified items commonly included in the identification results of the first identification unit 151 and the identification results of the second identification unit 152. 【0220】 In this embodiment, the identification result regarding the position of the object 100 (an example of the above-mentioned specified item) is commonly included in the identification result of the first identification unit 151 and the identification result of the second identification unit 152, so the identification unit 150 identifies a combination of the identification result of the first identification unit 151 and the identification result of the second identification unit 152 regarding the same object 100 placed on the object surface based on the position identified by the first identification unit 151 and the position identified by the second identification unit 152. 【0221】 That is, based on a comparison between the position identified by the first identification unit 151 and the position identified by the second identification unit 152, the identification unit 150 identifies the identification result of the first identification unit 151 and the identification result of the second identification unit 152 as identification results for the same object 100 placed on the object surface. 【0222】 In other words, when the position identified by the first identification unit 151 corresponds to the position identified by the second identification unit 152, the identification unit 150 determines that the combination of the type identified by the first identification unit 151 and the orientation identified by the second identification unit 152 is an identification result relating to the same object 100 placed on the object surface. 【0223】 "When the position identified by the first identification unit 151 corresponds to the position identified by the second identification unit 152" means when the position identified by the first identification unit 151 and the position identified by the second identification unit 152 can be considered to be the same, which can be rephrased as, for example, when the position identified by the first identification unit 151 and the position identified by the second identification unit 152 both correspond to the same area. 【0224】 For example, in the card game example described above, a plurality of zones Z1 to Z30 (partial areas) are defined within the game field F as areas for placing a card 60S, and a plurality of reading devices 20-1 to 20-30 are installed corresponding to the plurality of zones Z1 to Z30. When the card 60S is placed in any of the zones Z, the zone Z in which the card 60 is placed is identified from the image captured by the photographing device 30. Separately, the zone Z in which the card 60 is placed is also identified from the reading result of the reading device 20. That is, the zone Z corresponding to the reading device 20 that reads the information stored in the IC tag 73 of the card 60S is identified as the zone Z in which the card 60S is placed. In this case, "the position identified by the first identifying unit 151 corresponds to the position identified by the second identifying unit 152" refers to the case where the zone Z identified from the image captured by the photographing device 30 is the same as the zone Z identified from the reading result of the reading device 20. 【0225】 In addition, "when the position identified by the first identification unit 151 corresponds to the position identified by the second identification unit 152" may also be when the distance between the position identified from the image captured by the imaging unit 110 and the position identified from the reading result of the reading unit 130 is less than a threshold value. 【0226】 [1-6-6-4] The second identification unit 152 can identify the type of a card 60S (first card) placed on the game field F with other cards 60S (second cards) stacked on it, based on information read by the reading unit 130 from the IC tag 73 of the card 60S (first card). For example, even in the situation shown in FIG. 7 where a deck of cards 600-1 is placed in zone Z7, the second identification unit 152 can identify the type of each of the multiple cards 60S included in the deck of cards 600-1, based on information read by the reading unit 130 from the IC tag 73 of each of the multiple cards 60S. 【0227】 [1-6-7] The display control unit 160 causes the display unit 170 to display an object corresponding to the target object 100 placed on the target surface. For example, the display control unit 160 is realized by at least one of the control unit 41 of the information processing device 40 and the control unit 51 of the display terminal device 50. The display unit 170 is realized by at least one of the display unit 45 of the information processing device 40 and the display unit 55 of the display terminal device 50. 【0228】 An "object" is something that is displayed on the display unit 170. For example, an "object" is an object that resembles the object 100. In other words, an "object" is an image of the object 100. An "object" may be an object (text, icon, etc.) that indicates the type or name of the object 100, or the effect it has on the progress or outcome of the game. 【0229】 For example, the display control unit 160 causes the display unit 170 to display an object corresponding to the type of object 100 identified by the identification unit 150 in a state corresponding to the state of the object 100 identified by the identification unit 150. Specifically, the display control unit 160 causes the object corresponding to the type of object 100 identified by the identification unit 150 to be displayed at a display position corresponding to the position (position on the object surface) of the object 100 identified by the identification unit 150. Furthermore, the display control unit 160 causes the object corresponding to the type of object 100 identified by the identification unit 150 to be displayed in an orientation corresponding to the orientation of the object 100 identified by the identification unit 150. 【0230】 Furthermore, for example, the display control unit 160 causes the display unit 170 to display an object corresponding to the type of the object 100 identified by the identification unit 150 in accordance with the state of the object 100 identified by the identification unit 150. 【0231】 Specifically, the display control unit 160 determines whether or not to display on the display unit 170 an object corresponding to the type of object 100 identified by the identification unit 150 as an object corresponding to the object 100, depending on the state of the object 100 identified by the identification unit 150. 【0232】 That is, the display control unit 160 determines whether the state of the object 100 identified by the identification unit 150 is a predetermined state. Then, when it is determined that the state of the object 100 identified by the identification unit 150 is not a predetermined state, the display control unit 160 causes the display unit 170 to display an object corresponding to the type of object 100 identified by the identification unit 150 as an object corresponding to the object 100. On the other hand, when it is determined that the state of the object 100 identified by the identification unit 150 is a predetermined state, the display control unit 160 does not cause the display unit 170 to display an object corresponding to the type of object 100 identified by the identification unit 150 as an object corresponding to the object 100. In this case, the display control unit 160 causes the display unit 170 to display an object regardless of the type of object 100 identified by the identification unit 150 as an object corresponding to the object 100. 【0233】 Furthermore, when the object 100 is placed on the target surface so that the above-mentioned writing surface (the surface on which information is written) of the object 100 faces the target surface, the display control unit 160 causes the display unit 170 to display a display corresponding to the information written on the writing surface of the object 100 identified by the identification unit 150 (second identification unit 152). 【0234】 "When the object 100 is placed on the object surface so that the writing surface and the object surface face each other" means when the object 100 is placed on the object surface so that the writing surface is not visible from the imaging unit 110. 【0235】 For example, if the object 100 is a play medium contained in a container, "when the object 100 is placed on the object surface so that the writing surface and the object surface face each other" means when the object 100 is placed on the object surface so that the writing surface of the play medium and the object surface face each other via the container. In other words, when the object 100 is placed on the object surface so that the writing surface of the play medium and the object surface are in contact via the container. 【0236】 In addition, when the object 100 is a play medium alone, "when the object 100 is placed on the object surface so that the writing surface and the object surface face each other" means when the object 100 (play medium) is placed on the object surface so that the writing surface of the play medium and the object surface are in contact with each other. 【0237】 "Displaying on display unit 170 an indication corresponding to the information written on the writing surface" means, for example, displaying on display unit 170 the information written on the writing surface of object 100. In this case, all of the information written on the writing surface may be displayed on display unit 170, or only part of the information written on the writing surface may be displayed on display unit 170. 【0238】 Specifically, "displaying on display unit 170 an indication corresponding to information written on the writing surface" means displaying on display unit 170 an object that resembles the writing surface of object 100. In other words, it means displaying on display unit 170 an object that is an image of the writing surface of object 100. 【0239】 For example, if the type of object 100 or the details of the effect on the progress or outcome of the game, etc. are written on the writing surface, "displaying an indication according to the information written on the writing surface on the display unit 170" may mean displaying text, a design, etc. indicating the type of object 100 or the details of the effect on the progress or outcome of the game, etc. on the display unit 170. In this case, the way in which the type of object or the details of the effect on the progress or outcome of the game, etc. are displayed on the display unit 170 may be different from the way in which they are displayed on the writing surface. 【0240】 For example, if the type of object 100 is written on the writing surface, "displaying on the display unit 170 a display corresponding to the information written on the writing surface" may also mean displaying on the display unit 170 text or a pattern or the like indicating an item that is not written on the writing surface but is identified from the type of object 100 (for example, the effect that the object 100 will have on the progress or outcome of the game). 【0241】 In addition, "displaying a display corresponding to the information written on the writing surface on the display unit 170" may also mean transmitting data regarding a display corresponding to the information written on the writing surface to another device, thereby displaying a display corresponding to the information written on the writing surface on the display unit 170 of the other device. 【0242】 The display control unit 160 causes the display unit 170 to display a display corresponding to the information written on the writing surface of the object 100 identified by the identification unit 150 (second identification unit 152), at least when the object 100 is placed on the object surface so that the writing surface and the object surface face each other. 【0243】 The display control unit 160 may cause the display unit 170 to display a display corresponding to information written on the writing surface of the object 100 identified by the identification unit 150 (second identification unit 152) even when the object 100 is placed on the object surface such that the writing surface and the object surface do not face each other (i.e., when the object 100 is placed on the object surface with the writing surface visible), or may cause the display unit 170 to display a display corresponding to information written on the writing surface of the object 100 identified by another identification method. For example, when the object 100 is placed on the object surface such that the writing surface and the object surface do not face each other (i.e., when the object 100 is placed on the object surface with the writing surface visible), the display control unit 160 may read the information written on the writing surface of the object 100 and cause the display unit 170 to display a display corresponding to the read information. For example, when the object 100 is placed on the object surface with the written surface visible in the image captured by the image capturing unit 110, the information written on the written surface of the object 100 can be identified from the image captured by the image capturing unit 110, and a display corresponding to the identified information can be displayed on the display unit 170. 【0244】 In addition, when the object 100 is placed on the target surface with the writing surface and the target surface facing each other, and a predetermined operation is accepted regarding an object corresponding to the object 100, the display control unit 160 may cause the display unit 170 to display a display corresponding to the information written on the writing surface of the object 100. 【0245】 The "predetermined operation" is, for example, an operation to specify (or select) an object. The "predetermined operation" may be an operation to specify any of the objects, and may be an operation to specify the type, position, or orientation of the object. Based on such an operation, an object corresponding to the specified type, position, or orientation is specified. For example, based on such an operation, a process is executed to display on the display unit 170 a display according to information written on the writing surface of the target object 100 corresponding to the object. 【0246】 In the case of the card game example described above, each of the parts PB-1 and PB-2 shown in Fig. 8 corresponds to an example of an "object," and the part PC shown in Fig. 9 corresponds to an example of a "display according to information written on the writing surface." In the case of the card game example described above, the display control unit 160 causes the display unit 170 to display the game field image G. 【0247】 For example, the display control unit 160 determines whether the orientation of the card 60S identified by the first identification unit 151 is face up or face down. 【0248】 Then, when the card 60S identified by the first identification unit 151 is facing up, the display control unit 160 displays an image of the front 61 of the card 60S (i.e., an image corresponding to the type of the card 60S identified by the second identification unit 152), such as part PB-2 shown in FIG. 8, as a part to be associated with the card 60S, at a position in the game field image G corresponding to the position of the card 60S identified by the first identification unit 151 or the second identification unit 152. 【0249】 On the other hand, if the card 60S identified by the first identification unit 151 is facing down, the display control unit 160 does not display an image of the front side 61 of the card 60S (i.e., an image corresponding to the type of the card 60S identified by the second identification unit 152) such as part PB-2 shown in Figure 8 as a part to be associated with the card 60S, but instead displays an image of the back side 62 of the card 60S (i.e., an image independent of the type of the card 60S identified by the second identification unit 152) such as part PB-1 shown in Figure 8 at a position within the game field image G corresponding to the position of the card 60S identified by the first identification unit 151 or the second identification unit 152. 【0250】 In addition, the display control unit 160 displays a part PC showing the front surface 61 of the card 60S in response to a designation operation of a part associated with a card 60S placed face down, such as part PB-1 shown in Figure 8. 【0251】 [2. Second Embodiment] A second embodiment of the present invention will now be described. 【0252】 The second embodiment differs from the first embodiment in that the orientation of the card (vertical or horizontal) is identified based on information stored in the IC tag. The differences from the first embodiment will be described below. In the following, the same elements as those in the first embodiment will be designated by the same reference numerals and their description will be omitted. 【0253】 [2-1. Overview] Figure 23 shows an example of a sleeve 70A of the second embodiment. Like the sleeve 70 of the first embodiment, the front surface 71A of the sleeve 70A is transparent, allowing the front surface 61 of the card 60 housed in the sleeve 70A to be seen from outside the sleeve 70A. Also, like the sleeve 70 of the first embodiment, the back surface 72A of the sleeve 70A is opaque, giving all sleeves 70A a common appearance. 【0254】 23, the sleeve 70A includes a first IC tag 73A-1 and a second IC tag 73A-2. The first IC tag 73A-1 and the second IC tag 73A-2 are provided on the inner surface of the back surface 72A. For example, the first IC tag 73A-1 and the second IC tag 73A-2 are installed at different positions on the inner surface of the back surface 72A. For example, the installation positions of the first IC tag 73A-1 and the second IC tag 73A-2 are set so that the difference between their positions in a first direction (e.g., the vertical direction) and the difference between their positions in a second direction (e.g., the horizontal direction) are different. 【0255】 The tag ID of the first IC tag 73A-1 is stored in the first IC tag 73A-1, and the tag ID of the second IC tag 73A-2 is stored in the second IC tag 73A-2. Since the first IC tag 73A-1 and the second IC tag 73A-2 are separate IC tags, their tag IDs are different from each other. 【0256】 In the second embodiment, a card 60 is housed in the sleeve 70A as described above. Hereinafter, the card 60 housed in the sleeve 70A will be referred to as a "card 60SA" for convenience in order to distinguish it from the card 60 alone. In other words, when the card 60 is housed in the sleeve 70A, the card 60 and the sleeve 70A will be regarded as a single object and will be referred to as a "card 60SA." 【0257】 Furthermore, in the second embodiment, in order to be able to identify the positions of the first IC tag 73A-1 and the second IC tag 73A-2 of the card 60SA placed on the game field F, a reading device 20 is installed which is an antenna for receiving signals transmitted from each of the first IC tag 73A-1 and the second IC tag 73A-2, and which is equipped with a plurality of antennas installed so as to correspond to a plurality of positions on the game field F. For example, in the second embodiment, a reading device 20 is installed which is equipped with a plurality of first antennas 21 and a plurality of second antennas 22 as shown in FIG. 【0258】 That is, when the card 60SA is placed on the game field F, the position of the first IC tag 73A-1 on the game field F can be identified by identifying the combination of the first antenna 21 and the second antenna 22 that received the signal from the first IC tag 73A-1 (the ID tag of the first IC tag 73A-1) (in other words, the combination of the first antenna 21 and the second antenna 22 that received the strongest signal from the first IC tag 73A-1). For example, the intersection of the first antenna 21 and the second antenna 22 that received the signal from the first IC tag 73A-1 (in other words, the first antenna 21 and the second antenna 22 that received the strongest signal) can be identified as the position of the first IC tag 73A-1 on the game field F. 【0259】 Similarly, the position of the second IC tag 73A-2 on the game field F can be determined by identifying the combination of the first antenna 21 and the second antenna 22 that received the signal from the second IC tag 73A-2 (the ID tag of the second IC tag 73A-2) (the combination of the first antenna 21 and the second antenna 22 that received the strongest signal from the second IC tag 73A-2). 【0260】 Fig. 24 shows a case where the card 60SA is placed vertically on the game field F, and Fig. 25 shows a case where the card 60SA is placed horizontally on the game field F. Here, as shown in Figs. 24 and 25, a coordinate system is assumed in which a predetermined point on the game field F (for example, the lower left point) is set as the origin O, the horizontal direction of the game field F is set as the X-axis direction, and the vertical direction of the game field F is set as the Y-axis direction. Furthermore, the position of the first IC tag 73A-1 on the game field F is set as (X1, Y1), and the position of the second IC tag 73A-2 on the game field F is set as (X2, Y2). 【0261】 24, when the card 60SA is placed vertically, the long side of the card 60SA is parallel (or approximately parallel) to the Y-axis direction, and the card 60SA is vertically long. In this case, the absolute value of the difference between Y1 and Y2 (|Y1-Y2|) is greater than the absolute value of the difference between X1 and X2 (|X1-X2|). Therefore, when the identified positions of the first IC tag 73A-1 and the second IC tag 73A-2 have the relationship |Y1-Y2|>|X1-X2|, it can be determined that the card 60SA is placed vertically. 【0262】 25, when the card 60SA is placed horizontally, the long side of the card 60SA is parallel (or approximately parallel) to the X-axis direction, and the card 60SA is long in the landscape orientation. In this case, the absolute value of the difference between X1 and X2 (|X1-X2|) is greater than the absolute value of the difference between Y1 and Y2 (|Y1-Y2|). Therefore, when the identified positions of the first IC tag 73A-1 and the second IC tag 73A-2 have the relationship |X1-X2|>|Y1-Y2|, it can be determined that the card 60SA is placed horizontally. 【0263】 As described above, in the second embodiment, the positions of the first IC tag 73A-1 and the second IC tag 73A-2 can be identified based on the reading result of the reader 20, and the vertical and horizontal orientation of the card 60SA can be identified based on the positional relationship between them. 【0264】 [2-2. Processing] The processing executed by the system 1A according to the second embodiment will be described. 【0265】 [2-2-1] In the second embodiment, an association process similar to the association process shown in Fig. 10 is also executed. However, in step S404, the control unit 41 acquires the tag IDs of the first IC tag 73A-1 and the second IC tag 73A-2, and in step S406, the control unit 41 registers the tag IDs of both the first IC tag 73A-1 and the second IC tag 73A-2 in the "tag ID" field of the association data D1. 【0266】 [2-2-2] In the second embodiment, an association process similar to the association process shown in Fig. 12 may also be executed. However, in step S424, the control unit 41 writes the card ID identified in step S422 to both the first IC tag 73A-1 and the second IC tag 73A-2. 【0267】 [2-2-3] In the second embodiment, a specific process similar to the specific process shown in FIG. 13 is also executed. 【0268】 In the second embodiment, in step S432, the control unit 41 identifies the position and front / back orientation of the card 60SA, but does not identify the vertical / horizontal orientation of the card 60SA. In this case, the identification result in step S432 is registered in the first identification result data D2A. FIG. 26 shows an example of the first identification result data D2A in the second embodiment. As shown in FIG. 26, the first identification result data D2A includes an "area ID" and a "front / back flag" field. The "area ID" and "front / back flag" fields are similar to the "area ID" and "front / back flag" fields of the first identification result data D2 in the first embodiment. 【0269】 In the second embodiment, in step S436, the control unit 41 identifies the card ID, position, and vertical and horizontal orientation of the card 60SA placed on the game field F. 【0270】 For example, the control unit 41 refers to the association data D1 and identifies the card ID associated with the tag ID read from the first IC tag 73A-1 and the tag ID read from the second IC tag 73A-2. 【0271】 Furthermore, when the tag ID read from the first IC tag 73A-1 and the ID tag read from the second IC tag 73A-2 are associated with the same card ID, the control unit 41 considers that the first IC tag 73A-1 and the second IC tag 73A-2 are provided on the same card 60SA. Then, the control unit 41 executes the processing described below for the first IC tag 73A-1 and the second IC tag 73A-2 provided on the same card 60SA. 【0272】 That is, the control unit 41 determines the position of the first IC tag 73A-1 on the game field F by identifying the combination of the first antenna 21 and the second antenna 22 that received the signal (tag ID) from the first IC tag 73A-1 (in other words, the combination of the first antenna 21 and the second antenna 22 that received the strongest signal from the first IC tag 73A-1). 【0273】 Similarly, the control unit 41 determines the position of the second IC tag 73A-2 on the game field F by identifying the combination of the first antenna 21 and the second antenna 22 that received the signal (tag ID) from the second IC tag 73A-2 (in other words, the combination of the first antenna 21 and the second antenna 22 that received the strongest signal from the second IC tag 73A-2). 【0274】 Then, the control unit 41 identifies the midpoint between the position of the first IC tag 73A-1 and the position of the second IC tag 73A-2 as the position of the card 60SA, and determines which zone Z the identified position falls within, thereby identifying the zone Z in which the card 60SA is placed. 【0275】 Furthermore, the control unit 41 identifies the vertical and horizontal orientation of the card 60SA based on the positional relationship between the position of the first IC tag 73A-1 and the position of the second IC tag 73A-2. 【0276】 For example, if the vertical difference (|Y2-Y1|) between the positions of the first IC tag 73A-1 and the second IC tag 73A-2 is greater than the horizontal difference (|X2-X1|), the control unit 41 determines that the card 60SA is placed vertically. On the other hand, if the vertical difference (|Y2-Y1|) between the positions of the first IC tag 73A-1 and the second IC tag 73A-2 is smaller than the horizontal difference (|X2-X1|), the control unit 41 determines that the card 60SA is placed horizontally. 【0277】 In the second embodiment, the identification result in step S436 is registered in second identification result data D3A. FIG. 27 shows an example of the second identification result data D3A. As shown in FIG. 27, the second identification result data D3A includes "Zone ID," "Card ID," and "Vertical / Horizontal Flag" fields. The "Zone ID" field is similar to the "Zone ID" field in the game field situation data D4 of the first embodiment. The "Card ID" field is similar to the "Card ID" field in the second identification result data D3 of the first embodiment. The "Vertical / Horizontal Flag" field is similar to the "Vertical / Horizontal Flag" field in the first identification result data D2 of the first embodiment. 【0278】 In the second embodiment, in step S438, the control unit 41 generates game field situation data D4 based on the first identification result data D2A and the second identification result data D3A. The game field situation data D4 is the same as in the first embodiment. The processing in step S438 is the same as step S438 in the first embodiment, except that the length / width flag registered in the "length / width flag" field of the second identification result data D3A is registered in the "length / width flag" field of the game field situation data D4. 【0279】 [2-2-4] In the second embodiment, the display control process shown in FIG. 18 and the process shown in FIG. 19 are also executed. 【0280】 [2-3. Effects] According to the second embodiment, the vertical and horizontal orientation of the card 60SA placed on the game field F can be identified based on the reading result of the reading device 20. 【0281】 [2-4. Modifications] Modifications of the second embodiment will now be described. 【0282】 [2-4-1] In the embodiment described above, the installation positions of the first IC tag 73A-1 and the second IC tag 73A-2 are not limited to the example shown in Fig. 23. The installation positions of the first IC tag 73A-1 and the second IC tag 73A-2 may be set so that they have a positional relationship that allows the vertical and horizontal orientation of the card 60SA to be identified from the positional relationship between the first IC tag 73A-1 and the second IC tag 73A-2 of the card 60SA placed on the game field F, if the positions of the first IC tag 73A-1 and the second IC tag 73A-2 can be identified. 【0283】 For example, the first IC tag 73A-1 may be placed in the upper left position on the back surface 72A, and the first IC tag 73A-2 may be placed in the upper right position on the back surface 72A. Alternatively, for example, the first IC tag 73A-1 may be placed in the upper left position on the back surface 72A, and the first IC tag 73A-2 may be placed in the lower left position on the back surface 72A. 【0284】 [2-4-2] In addition to the first IC tag 73A-1 and the second IC tag 73A-2, one or more IC tags may be installed on the back surface 72A. That is, three or more IC tags may be installed on the back surface 72A, and the vertical and horizontal orientation of the card 60SA may be identified based on the relative positions of the three or more IC tags. 【0285】 [2-4-3] In the second embodiment, control unit 41 may also identify the portrait / landscape orientation of card 60SA in step S432. That is, control unit 41 may identify the portrait / landscape orientation of card 60SA from the image captured by photographing device 30, and may also identify the portrait / landscape orientation of card 60SA from the reading result by reading device 20. In this case, the accuracy of the portrait / landscape orientation identification result may be improved by comparing the portrait / landscape orientation identification result obtained from the image captured by photographing device 30 with the portrait / landscape orientation identification result obtained from the reading result by reading device 20. 【0286】 [2-4-4] In the embodiment described above, the sleeve 70A (rear surface 72A) is provided with the first IC tag 70A-1 and the second IC tag 70A-2, but a sheet-like object, such as object 80 shown in Fig. 20, that is accommodated in the sleeve 70A together with the card 60 may be provided with the first IC tag 70A-1 and the second IC tag 70A-2. In this case, the sheet-like object and card 60 accommodated in the sleeve 70A corresponds to the card 60SA. 【0287】 [2-4-5] The card 60 itself (for example, the back surface 62) may include the first IC tag 70A-1 and the second IC tag 70A-2. 【0288】 [2-5. Functional Elements] Fig. 28 is a functional block diagram for explaining the functional elements included in the system 1A according to the second embodiment. In Fig. 28, the same functional elements as those in the first embodiment (the photographing unit 110, the photographed image acquiring unit 120, the reading unit 130, the reading result acquiring unit 140, the display control unit 160, and the display unit 170) are assigned the same reference numerals as those in Fig. 22, and explanations of these functional elements will be omitted here, and only the target object 100A and the identification unit 150A will be explained. In addition, explanations of wording that overlap with those in the first embodiment will be omitted. 【0289】 [2-5-1] First, the target object 100A will be described. Here, differences between the target object 100A and the target object 100 in the first embodiment will be described. 【0290】 The object 100A includes a first holding part 101A and a second holding part 102A that is provided so as to have a predetermined positional relationship with the first holding part 101A. The first holding part 101A and the second holding part 102A have a positional relationship such that if the positions of the first holding part 101A and the second holding part 102A of the object 100A placed on the object surface can be identified, the orientation of the object 100A can be identified from those positions. For example, the positions of the first holding part 101A and the second holding part 102A on the object 100A are set so that when the object 100A is placed on the object surface in a first orientation, the positional relationship between the first holding part 101A and the second holding part 102A on the object surface becomes a first positional relationship, and when the object 100A is placed on the object surface in a second orientation different from the first orientation, the positional relationship between the first holding part 101A and the second holding part 102A on the object surface becomes a second positional relationship different from the first positional relationship. 【0291】 Specific information for identifying the type or state of object 100A placed on the target surface is held in first holding unit 101A and second holding unit 102A. The information held in first holding unit 101A and second holding unit 102A is read by reading unit 130. In this embodiment, first IC tag 73A-1 corresponds to first holding unit 101A, and second IC tag 73A-2 corresponds to second holding unit 102A. 【0292】 [2-5-2] The determination unit 150A will be described. The determination unit 150A includes a first determination unit 151A and a second determination unit 152A. 【0293】 The first identifying unit 151A identifies the position and orientation of the object 100A based on the image captured by the imaging unit 110. For example, the first identifying unit 151A identifies the position and the orientation of the front and back of the object 100A in the same manner as the first identifying unit 151 of the first embodiment. 【0294】 Based on the reading result of the reading unit 130, the second identifying unit 152A identifies the position, type, and orientation of the target object 100A. 【0295】 The second identification unit 152A identifies the type of the object 100A in the same manner as the second identification unit 152 in the first embodiment. 【0296】 As mentioned above, in the second embodiment, the reading unit 130 is an antenna that receives signals transmitted from each of the first holding unit 101A (first IC tag 73A-1) and the second holding unit 102A (second IC tag 73A-2), and is equipped with multiple antennas (multiple first antennas 21 and multiple second antennas 22) installed to correspond to multiple positions on the game field F, respectively. 【0297】 The second identification unit 152A identifies the position and orientation of the object 100A placed on the target surface based on which of the multiple antennas received the signals transmitted from each of the first holding unit 101A (first IC tag 73A-1) and second holding unit 102A (second IC tag 73A-2) of the object 100A placed on the target surface. 【0298】 In order to distinguish whether a signal received by the antenna is transmitted from the first holding unit 101A or the second holding unit 102A, the information held in each of the first holding unit 101A and the second holding unit 102A includes different information, and the signals transmitted from each of the first holding unit 101A and the second holding unit 102A include different information. For example, the identification information of the first holding unit 101A (the tag ID of the first IC tag 73A-1) is held in the first holding unit 101A (the first IC tag 73A-1), and the identification information of the second holding unit 102A (the tag ID of the second IC tag 73A-2) is held in the second holding unit 102A (the second IC tag 73A-2). 【0299】 [2-5-3] In the example of the card game described above, the card 60SA corresponds to the object 100A. In a modified example in which the card 60 itself is equipped with the first IC tag 73A-1 and the second IC tag 73A-2, the card 60 alone corresponds to the object 100A. 【0300】 The second identification unit 152A identifies the position of the first IC tag 73A-1 on the game field F by identifying the combination of the first antenna 21 and the second antenna 22 that received a signal from the first IC tag 73A-1 of the card 60SA placed on the game field F (the combination of the first antenna 21 and the second antenna 22 with the strongest signal received from the first IC tag 73A-1) (the tag ID of the first IC tag 73A-1). Similarly, the second identification unit 152A also identifies the position of the second IC tag 73A-2 on the game field F by identifying the combination of the first antenna 21 and the second antenna 22 that received a signal from the second IC tag 73A-2 of the card 60SA placed on the game field F (the combination of the first antenna 21 and the second antenna 22 with the strongest signal received from the second IC tag 73A-2). Then, the second identification unit 152A identifies the vertical and horizontal orientation of the card 60SA based on the positional relationship between the first IC tag 73A-1 and the second IC tag 73A-2 on the game field F. 【0301】 In this way, in the second embodiment, the positions of the first IC tag 73A-1 and the second IC tag 73A-2 on the game field F are determined based on the tag ID of the first IC tag 73A-1 stored in the first IC tag 73A-1 and the tag ID of the second IC tag 73A-2 stored in the second IC tag 73A-2, and the vertical and horizontal orientation of the card 60SA is determined based on the positional relationship between the first IC tag 73A-1 and the second IC tag 73A-2 on the game field F, so the tag ID of the first IC tag 73A-1 and the tag ID of the second IC tag 73A-2 correspond to "basic information for determining the state of the object 100A." 【0302】 [3. Third Embodiment] A third embodiment of the present invention will now be described. 【0303】 The third embodiment differs from the first embodiment in that the orientation of the card (front and back) is identified based on information stored in an IC tag. The differences from the first embodiment will be described below. Note that, in the following, the same reference numerals will be used for elements that are the same as those in the first embodiment, and their description will be omitted. 【0304】 [3-1. Overview] Figure 29 shows an example of a sleeve 70B of the third embodiment. Figure 29 shows a cross-sectional view of the sleeve 70B when viewed from the side. Like the sleeve 70 of the first embodiment, the front surface 71B of the sleeve 70B is transparent, allowing the front surface 61 of the card 60 housed in the sleeve 70B to be seen from outside the sleeve 70B. Also, like the sleeve 70 of the first embodiment, the back surface 72B of the sleeve 70B is opaque, giving all sleeves 70B a common appearance. 【0305】 29, the sleeve 70B includes a first IC tag 73B-1, a second IC tag 73B-2, and a blocking surface portion 74B. For example, the blocking surface portion 74B has the same (or substantially the same) shape and size as the back surface portion 72B of the sleeve 70B. The upper and lower ends of the blocking surface portion 74B are connected to the upper and lower ends of the back surface portion 72B, and the blocking surface portion 74B is fixed to the sleeve 70B. 【0306】 A first surface 75B of the blocking surface portion 74B faces the surface portion 71B of the sleeve 70B. A first IC tag 73B-1 is provided on the first surface 75B. Therefore, the first IC tag 73B-1 faces the surface portion 71B of the sleeve 70B. A second surface 76B of the blocking surface portion 74B faces the back surface portion 72B of the sleeve 70B. A second IC tag 73B-2 is provided on the second surface 76B. Therefore, the second IC tag 73B-2 faces the back surface portion 72B of the sleeve 70B. 【0307】 The tag ID of the first IC tag 73B-1 is stored in the first IC tag 73B-1, and the tag ID of the second IC tag 73B-2 is stored in the second IC tag 73B-2. Since the first IC tag 73B-1 and the second IC tag 73B-2 are separate IC tags, their tag IDs are different from each other. 【0308】 The blocking surface portion 74B is formed of a material (e.g., a magnetic material) that prevents transmission and reception of signals between the first IC tag 73B-1 and the second IC tag 73B-2 and the reader 20. Therefore, the blocking surface portion 74B prevents a signal transmitted from the second surface 76B (rear surface portion 72B) from being received by the first IC tag 73B-1 and a signal from the first IC tag 73B-1 from being transmitted to the second surface 76B (rear surface portion 72B). Similarly, the blocking surface portion 74B prevents a signal transmitted from the first surface 75B (front surface portion 71B) from being received by the second IC tag 73B-2 and a signal from the second IC tag 73B-2 from being transmitted to the first surface 75B (front surface portion 71B). 【0309】 The card 60 is accommodated in the space between the surface portion 71B and the blocking surface portion 74B of the sleeve 70B. Hereinafter, the card 60 accommodated in the sleeve 70B will be referred to as the "card 60SB" for convenience in order to distinguish it from the card 60 alone. In other words, when the card 60 is accommodated in the sleeve 70B, the card 60 and the sleeve 70B will be regarded as a single object and will be referred to as the "card 60SB." 【0310】 When the card 60SB is placed face up in zone Z, the card 60SB is placed so that the back surface 72B of the card 60SB is in contact with the game field F. In this case, the transmission and reception of signals between the reader 20 installed under zone Z and the first IC tag 73B-1 is blocked by the blocking surface 74B (magnetic material, etc.), and therefore the information (tag ID, etc.) stored in the first IC tag 73B-1 is not read by the reader 20. As a result, the reader 20 reads information only from the second IC tag 73B-2. 【0311】 On the other hand, when the card 60SB is placed face down in zone Z, the card 60SB is placed so that the obverse surface 71B of the card 60SB is in contact with the game field F. In this case, the shielding surface 74B (magnetic material or the like) prevents signals from being transmitted and received between the reader 20 installed under zone Z and the second IC tag 73B-2, and therefore the tag ID stored in the second IC tag 73B-2 is not read by the reader 20. As a result, the reader 20 reads information (such as the tag ID) only from the first IC tag 73B-1. 【0312】 In this way, when card 60SB is placed face up, information is read only from second IC tag 73B-2 by reader 20. Similarly, when card 60SB is placed face down, information is read only from first IC tag 73B-1 by reader 20. Therefore, the front / back orientation of card 60SB can be identified based on whether the information stored in first IC tag 73B-1 or second IC tag 73B-2 is read. 【0313】 [3-2. Processing] The processing executed by the system 1B according to the third embodiment will be described. 【0314】 [3-2-1] Fig. 30 shows an example of the association process of the third embodiment. In the third embodiment, the association process shown in Fig. 30 is executed instead of the association process shown in Fig. 10. 【0315】 For example, a player places one card 60SB from his / her deck vertically and face up in a predetermined zone Z (such as zone Z11) in the game field F. In this state, the association process shown in FIG. 30 is executed. 【0316】 30, first, control unit 41 of information processing device 40 acquires an image captured by photographing device 30 (S400B). Then, control unit 41 identifies the card ID of card 60SB shown in the captured image from the captured image (S402B). Steps S400B and S402B are the same as steps S400 and S402 in FIG. 【0317】 Furthermore, the control unit 41 acquires the tag ID read by the reading device 20 (S404B). When the card 60SB is placed face up, the tag ID stored in the second IC tag 73B-2 is read by the reading device 20, and the read tag ID is supplied to the information processing device 40. The control unit 41 acquires the tag ID supplied in this manner. 【0318】 After executing step S404B, the control unit 41 outputs a turn-over request notification indicating that the player is requested to turn over the card 60SB (S406B). For example, the control unit 41 displays an image indicating the turn-over request notification on the display unit 45. Alternatively, the control unit 41 causes the audio output unit 46 to output a sound indicating the turn-over request notification. 【0319】 In response to the turn-over request notification, the player turns over the card 60SB placed in the zone Z, thereby turning the card 60SB face down. In this state, the processes from step S408B onwards are executed. 【0320】 That is, the control unit 41 acquires the tag ID read by the reading device 20 (S408B). When the card 60SB is placed face down, the tag ID stored in the first IC tag 73B-1 is read by the reading device 20, and the read tag ID is supplied to the information processing device 40. The control unit 41 acquires the tag ID supplied in this manner. 【0321】 Then, the control unit 41 registers the association between the card ID identified in step S402B and the tag ID acquired in steps S404B and S408B in the association data D1B (S410B). 【0322】 Fig. 31 shows an example of association data D1B. As shown in Fig. 31, association data D1B includes "card ID" and "tag ID" fields. The "card ID" field is similar to the "card ID" field of association data D1 in the first embodiment. The "tag ID" field includes "face up" and "face down" fields as subfields. The "face up" field is a field for registering the tag ID (i.e., the tag ID of the second IC tag 73B-2) that is acquired when card 60SB is placed face down. The "face down" field is a field for registering the tag ID (i.e., the tag ID of the first IC tag 73B-1) that is acquired when card 60SB is placed face down. 【0323】 In step S410B, the control unit 41 adds a new record to the association data D1B, registers the card ID identified in step S402B in the "Card ID" field, registers the tag ID obtained in step S404B in the "Front" field, and registers the tag ID obtained in step S408B in the "Back" field. 【0324】 After step S410B is executed, a completion notice is output indicating that the association process is complete, and the player removes the card 60SB placed in zone Z and places the next card 60SB from his / her deck vertically and face up in zone Z. In this state, the association process shown in Figure 30 is executed again. 【0325】 30 is executed for each card 60SB included in the deck of the first player, whereby information on all cards 60SB included in the deck of the first player is registered in the association data D1B. Similarly, for each card 60SB included in the deck of the second player, the association process shown in FIG. 30 is executed for each card 60SB included in the deck of the second player, whereby information on all cards 60SB included in the deck of the second player is registered in the association data D1B. 【0326】 [3-2-2] Fig. 32 shows another example of the association process according to the third embodiment. Instead of the association process shown in Fig. 30, the association process shown in Fig. 32 may be executed. 【0327】 32 is based on the premise that an IC tag writer for writing information to the first IC tag 73B-1 and the second IC tag 73B-2 is installed below the zone Z. In the following, the reader 20 will be described as an IC tag reader / writer having the functions of both an IC tag reader and an IC tag writer. 【0328】 32, first, control unit 41 acquires an image captured by photographing device 30 (S420B). Then, control unit 41 identifies the card ID of card 60SB shown in the captured image from the captured image (S422B). The processes of steps S420B and S422B are the same as steps S400 and S402 in FIG. 【0329】 After executing step S422B, the control unit 41 writes the card ID and the front / back flag identified in step S422B to the second IC tag 73B-2 of the card 60SB placed in the zone Z (S424B). 【0330】 The front / back flag is information indicating whether the card 60SB is placed face up or face down. For example, a value of "0" or "1" is set as the front / back flag. The value "0" indicates that the card 60SB is placed face up, and the value "1" indicates that the card 60SB is placed face down. In step S424B, the value "0" indicating that the card is placed face up is written as the front / back flag. 【0331】 The control unit 41 sends a write instruction for the card ID and front / back flag (0) identified in step S422B to the reading device 20 (IC tag reader / writer) placed under the above-mentioned zone Z. Then, in response to the write instruction, the reading device 20 writes the card ID and front / back flag (0) to the second IC tag 73B-2 of the card 60SB placed in the above-mentioned zone Z. In this case, since the transmission and reception of signals between the first IC tag 73B-1 and the reading device 20 is prevented by the blocking surface portion 74B (magnetic material, etc.), writing to the first IC tag 73B-1 is not performed at this point. 【0332】 After executing step S424B, the control unit 41 outputs a turn-over request notification indicating that the player is requested to turn over the card 60SB (S426B). The process of step S426B is the same as step S406B in FIG. 【0333】 In response to the turn-over request notification, the player turns over the card 60SB placed in the zone Z, thereby turning the card 60SB face down. In this state, the process of step S428B is executed. 【0334】 That is, the control unit 41 writes the card ID and the front / back flag identified in step S422B to the first IC tag 73B-1 of the card 60SB placed in the zone Z (S428B). In this case, the value "1" indicating that the card is face down is written as the front / back flag. 【0335】 Specifically, the control unit 41 sends a write instruction for the card ID and front / back flag (1) identified in step S422B to the reading device 20 (IC tag reader / writer) placed under the above-mentioned zone Z. Then, in response to the write instruction, the reading device 20 writes the card ID and front / back flag (1) to the first IC tag 73B-1 of the card 60SB placed in the above-mentioned zone Z. In this case, since the transmission and reception of signals between the second IC tag 73B-2 and the reading device 20 is prevented by the blocking surface portion 74B (magnetic material, etc.), writing to the second IC tag 73B-2 is not performed at this point. 【0336】 After step S428B is executed, a completion notice indicating that the association process is complete is output, and the first player removes the card 60SB placed in zone Z and places the next card 60SB from his / her deck vertically and face up in zone Z. In this state, the association process shown in FIG. 32 is executed again. 【0337】 32 is executed for each card 60SB included in the deck of the first player, whereby a card ID and a head / tail flag are stored in the first IC tag 73B-1 and the second IC tag 73B-2 of each card 60SB included in the deck of the first player. Also, for each card 60SB included in the deck of the second player, the association process shown in Fig. 32 is executed for each card 60SB included in the deck of the second player, whereby a card ID and a head / tail flag are also stored in the first IC tag 73B-1 and the second IC tag 73B-2 of each card 60SB included in the deck of the second player. 【0338】 [3-2-3] In the third embodiment, a determination process similar to the determination process shown in Fig. 13 is also executed. Here, the determination process of the third embodiment will be described with reference to Fig. 13. In addition, the description will be given on the assumption that the association data D1B shown in Fig. 31 is stored in the storage unit 42. 【0339】 In the third embodiment, in step S432, the control unit 41 identifies the position and vertical and horizontal orientation of the card 60SB placed on the game field F, but does not identify the front and back orientation of the card 60SB. In this case, the identification result in step S432 is registered in the first identification result data D2B. 【0340】 Fig. 33 shows an example of the first identification result data D2B. As shown in Fig. 33, the first identification result data D2B includes "area ID" and "length / width flag" fields. The "area ID" and "length / width flag" fields are similar to the "area ID" and "length / width flag" fields of the first identification result data D2 of the first embodiment. 【0341】 In the third embodiment, in step S436, the control unit 41 identifies the card ID, position, and front / back orientation of the card 60SB placed on the game field F. 【0342】 For example, when card 60SB is placed face up in zone Z10, the tag ID stored in second IC tag 73B-2 is read by reader 20-10 and supplied as read result data of reader 20-10 to information processing device 40. In this case, since transmission and reception of signals between first IC tag 73B-1 and reader 20-10 is blocked by blocking surface portion 74B, the tag ID stored in first IC tag 73B-1 is not read by reader 20-10. 【0343】 The control unit 41 identifies the card ID and the front / back orientation of the card 60SB based on the tag ID read by the reader 20-10. The method for identifying the card ID is basically the same as step S436 in the first embodiment, except that the association data D1B is referenced instead of the association data D1. 【0344】 The control unit 41 refers to the association data D1B and determines whether the tag ID read by the reading device 20-10 is registered in the "face up" or "face down" field. If the tag ID read by the reading device 20-10 is registered in the "face up" field, the control unit 41 determines that the card 60SB is face up. On the other hand, if the tag ID read by the reading device 20-10 is registered in the "face down" field, the control unit 41 determines that the card 60SB is face down. 【0345】 In this case, the identification result in step S426 is registered in the second identification result data D3B. Fig. 34 shows an example of the second identification result data D3B. As shown in Fig. 34, the second identification result data D3B includes "reader ID", "card ID", and "front / back flag" fields. The "reader ID" and "card ID" fields are similar to the "reader ID" and "card ID" fields of the second identification result data D3 in the first embodiment, and the "front / back flag" field is similar to the "front / back flag" field of the first identification result data D2 in the first embodiment. 【0346】 For example, when a tag ID is read by the reading device 20-10, the control unit 41 registers the card ID and front / back orientation identified from the tag ID in the "Card ID" and "Front / Back Flag" fields of the record for the reading device ID "R10". 【0347】 Note that the above explanation has been given assuming that the association data D1B shown in Figure 31 has been stored in the memory unit 42 by the association process shown in Figure 30. However, if the card ID and front / back flag have been stored in the first IC tag 73B-1 and the second IC tag 73B-2 of the card 60SB by the association process shown in Figure 32, the card ID and front / back flag will be read by the reading device 20-10, and in step S436, the control unit 41 will register the card ID and front / back flag read by the reading device 20-10 in the "card ID" and "front / back flag" fields of the record for the reading device ID "R10". 【0348】 In the third embodiment, in step S438, the control unit 41 generates game field situation data D4 based on the first identification result data D2B and the second identification result data D3B. The game field situation data D4 is the same as in the first embodiment. In addition, the processing of step S438 in this case is the same as step S438 in the first embodiment, except that the heads / tails flag registered in the "heads / tails flag" field of the second identification result data D3B is registered in the "heads / tails flag" field of the game field situation data D4. 【0349】 7, a deck of cards 600-1 (i.e., multiple cards 60SB stacked face down) is placed in zone Z7, but in the third embodiment, due to the presence of the blocking surface portion 74B, only the ID tag stored in the first IC tag 73B-1 of the bottom card 60SB of the deck of cards 600-1 is read. As a result, only the card ID of the bottom card 60SB of the deck of cards 600-1 placed in zone Z7 is registered in the record for the reader ID "R7" in the second identification result data D3B and the "card ID" field of the record for the zone ID "Z7" in the game field situation data D4. The same is true for zones Z1, Z15, and Z21. 【0350】 [3-2-4] In the third embodiment as well, the display control process shown in Fig. 18 and the process shown in Fig. 19 are executed. However, in the parts PA-1 to PA-4 of the game field image G in the third embodiment, the numbers indicating the number of cards 60SB included in the card stacks 600-1 to 600-4 are not displayed. 【0351】 [3-3. Effects] According to the third embodiment, the front and back orientation of the card 60SB placed on the game field F can be identified based on the reading result of the reading device 20. 【0352】 In the third embodiment, it is necessary to ensure that when the card 60SB is placed face up, the information stored in the first IC tag 73B-1 is not read by the reading device 20, and when the card 60SB is placed face down, the information stored in the second IC tag 73B-2 is not read by the reading device 20. 【0353】 For example, if the distance between the first IC tag 73B-1 and the reader 20 is large when the card 60SB is placed face up (i.e., large enough that the information stored in the first IC tag 73B-1 cannot be read by the reader 20), and the distance between the second IC tag 73B-2 and the reader 20 is also large when the card 60SB is placed face down (i.e., large enough that the information stored in the second IC tag 73B-2 cannot be read by the reader 20), then no special measures need to be taken to ensure this. However, the card 60 and the sleeve 70 are thin, and the distance does not become large, so some measures must be taken to ensure this. In this regard, in the third embodiment, the above-mentioned guarantee is achieved by providing a blocking surface portion 74B inside the sleeve 70B. 【0354】 [3-4. Modifications] Modifications of the third embodiment will now be described. 【0355】 [3-4-1] In the embodiment described above, the second IC tag 73B-2 was installed on the second surface 76B of the blocking surface portion 74B, but the second IC tag 73B-2 may also be installed on the inner surface of the back surface portion 72B of the sleeve 70B. 【0356】 [3-4-2] In the embodiment described above, the blocking surface portion 74B is fixed to the sleeve 70B, but the blocking surface portion 74B may also be a sheet-like object that is housed in the sleeve 70B together with the card 60, such as the object 80 shown in Figure 20. 【0357】 [3-4-3] In the above-described embodiment, the blocking surface portion 74B is formed of a magnetic material, but the blocking surface portion 74B may be formed of a material other than a magnetic material. Any material can be used for the blocking surface portion 74B as long as it can prevent signals from being transmitted between the first IC tag 73B-1 and the reader 20 from being transmitted through the back surface portion 72B of the sleeve 70B, or prevent signals from being transmitted between the second IC tag 73B-2 and the reader 20 from being transmitted through the front surface portion 71A of the sleeve 70B. 【0358】 [3-4-4] In the third embodiment, too, in step S422, control unit 41 may identify the orientation of card 60SB. That is, control unit 41 may identify the orientation of card 60SB from the image captured by photographing device 30, and may also identify the orientation of card 60SB from the reading result by reading device 20. In this case, the accuracy of the identification result of the orientation of card 60SB may be improved by comparing the identification result of the orientation of card 60SB obtained from the image captured by photographing device 30 with the identification result of the orientation of card 60SB obtained from the reading result by reading device 20. 【0359】 [3-5. Functional Elements] Fig. 35 is a functional block diagram for explaining the functional elements included in the system 1B according to the third embodiment. In Fig. 35, the same functional elements as those in the first embodiment (the photographing unit 110, the photographed image acquiring unit 120, the reading unit 130, the reading result acquiring unit 140, the display control unit 160, and the display unit 170) are assigned the same reference numerals as those in Fig. 22, and explanations of these functional elements will be omitted here, and only the target object 100B and the identification unit 150B will be explained. Also, explanations of wording that overlap with those in the first embodiment will be omitted. 【0360】 [3-5-1] First, the target object 100B will be described. Here, differences between the target object 100B and the target object 100 in the first embodiment will be described. 【0361】 The object 100B includes a first surface portion and a second surface portion, which are similar to the first surface portion and second surface portion described as being included in the object 100 of the first embodiment. 【0362】 Furthermore, the object 100B includes a first holder 101B and a second holder 102B. The first holder 101B and the second holder 102B hold specific information for identifying the type and state of the object 100B placed on the object surface. In this case, the specific information includes basic information for identifying the type of the object 100B and basic information for identifying the state of the object 100B. If the object 100B is an object in which a play medium is contained in a container, the basic information for identifying the type or state of the play medium placed on the object surface while contained in the container corresponds to "basic information for identifying the type or state of the object 100B." 【0363】 The information held in the first holding unit 101B and the second holding unit 102B is read by the reading unit 130. To distinguish whether the information read by the reading unit 130 was held in the first holding unit 101B or the second holding unit 102B, the information held in each of the first holding unit 101B and the second holding unit 102B includes different information. For example, the identification information of the first holding unit 101B is held in the first holding unit 101B, and the identification information of the second holding unit 102B is held in the second holding unit 102B. In the third embodiment, the front / back orientation of the object 100B is identified based on the different information held in each of the first holding unit 101B and the second holding unit 102B, and therefore, the different information corresponds to "basic information for identifying the state of the object 100B." 【0364】 Furthermore, object 100B includes restriction unit 103B. Restriction unit 103B restricts reading unit 130 from reading information held in first holder 101B via the second surface of object 100B, and restricts reading unit 130 from reading information held in second holder 102B via the first surface of object 100B. 【0365】 For example, the first holder 101B is a first IC tag that is installed so as to communicate with the reading unit 130 (IC tag reader) via the first surface of the object 100B. In other words, the first holder 101B is a first IC tag that is restricted from communicating with the reading unit 130 (IC tag reader) via the second surface of the object 100B. 【0366】 Furthermore, the second holding unit 102B is a second IC tag that is installed so as to communicate with the reading unit 130 (IC tag reader) via the second surface of the object 100B. In other words, the second holding unit 102B is a second IC tag that is restricted from communicating with the reading unit 130 (IC tag reader) via the first surface of the object 100B. 【0367】 The first IC tag is placed so as to face the first surface of the object 100B. Alternatively, the first IC tag is placed on the inner surface of the first surface of the object 100B. Furthermore, the first IC tag is placed closer to the first surface of the object 100B than the second IC tag. Furthermore, the second IC tag is placed so as to face the second surface of the object 100B. Alternatively, the second IC tag is placed on the inner surface of the second surface of the object 100B. Furthermore, the second IC tag is placed closer to the second surface of the object 100B than the first IC tag. 【0368】 The first IC tag is placed between the first surface of the object 100B and the restricting section 103B, and the second IC tag is placed between the second surface of the object 100B and the restricting section 103B. The restricting section 103B restricts communication between the first IC tag and the reader 20 for reading information stored in the first IC tag or the second IC tag from being performed via the second surface of the object 100B, and restricts communication between the reader 20 and the second IC tag from being performed via the first surface of the object 100B. 【0369】 For example, the restriction unit 103B includes a magnetic material provided between the first IC tag and the second surface of the object 100B. The restriction unit 103B also includes a magnetic material provided between the second IC tag and the first surface of the object 100B. In other words, the restriction unit 103B includes a magnetic material provided between the first IC tag and the second IC tag. Any device that can block a signal (radio wave) from the first IC tag from being transmitted via the second surface of the object 100B or block a signal (radio wave) from the second IC tag from being transmitted via the first surface of the object 100B can be used as the restriction unit 103B. 【0370】 [3-5-2] The specification unit 150B will be described. The specification unit 150B includes a first specification unit 151B and a second specification unit 152B. 【0371】 The first identification unit 151B identifies the position and orientation of the object 100B based on the image captured by the image capturing device 30. For example, the first identification unit 151B identifies the position and vertical and horizontal orientation of the object 100B in the same manner as the first identification unit 151 of the first embodiment. 【0372】 The second identification unit 152B identifies the position, type, and orientation of the object 100B based on the reading result of the reading device 20. The second identification unit 152B identifies the position and type of the object 100B in the same manner as the second identification unit 152 of the first embodiment. 【0373】 The second identification unit 152B also identifies the front and back orientation of the object 100B. That is, based on the result of reading the information stored in the first holding unit 101B (first IC tag) or the second holding unit 102B (second IC tag) by the reading device 20, the second identification unit 152B identifies whether the object 100B is placed on the object surface with the first surface portion or the second surface portion of the object 100B facing the object surface. 【0374】 For example, when information stored in first holder 101B (first IC tag) is read by reader 130, second identification unit 152B determines that the first surface of object 100B faces toward reader 130. For example, when reader 130 is installed below the target surface, second identification unit 152B determines that the first surface of object 100B faces the target surface. When reader 130 is installed above the target surface, second identification unit 152B determines that the second surface of object 100B faces the target surface. 【0375】 On the other hand, when the information stored in the second holding unit 102B (second IC tag) is read by the reading unit 130, the second identifying unit 152B determines that the second surface of the object 100B faces the reading unit 130. For example, if the reading unit 130 is installed below the object surface, the second identifying unit 152B determines that the second surface of the object 100B faces the object surface. Note that, if the reading unit 130 is installed above the object surface, the second identifying unit 152B determines that the first surface of the object 100B faces the object surface. 【0376】 [3-5-3] In the example of the card game mentioned above, the card 60SB corresponds to an example of the target object 100B. Furthermore, the front surface 71B and back surface 72B of the sleeve 70B correspond to an example of a "first surface" and a "second surface," respectively. Furthermore, the first IC tag 73B-1 and second IC tag 73A-2 of the sleeve 70B correspond to an example of a first holding portion 101B (first IC tag) and a second holding portion 102B (second IC tag), respectively. Furthermore, the blocking surface portion 74B of the sleeve 70B corresponds to an example of a limiting portion 103B. 【0377】 For example, when the information stored in the first IC tag 73B-1 of the card 60SB is read by the reader 20, the second identification unit 152B identifies that the card 60SB is placed face down. On the other hand, when the information stored in the second IC tag 73B-2 of the card 60SB is read by the reader 20, the second identification unit 152B identifies that the card 60SB is placed face up. 【0378】 [4. Fourth Embodiment] A fourth embodiment of the present invention will now be described. 【0379】 The fourth embodiment differs from the first embodiment in that the type or state of the card is identified by reading a code printed on the sleeve in invisible ink. The differences from the first embodiment will be explained below. Note that, in the following, the same reference numerals will be used for elements that are the same as those in the first embodiment, and their explanation will be omitted. 【0380】 [4-1. Overview] Fig. 36 shows the configuration of a system 1C according to the fourth embodiment. As shown in Fig. 36, the system 1C includes a game board 10C, a first image capturing device 30C-1, a second image capturing device 30C-2, an information processing device 40, and a display terminal device 50. The information processing device 40 and the display terminal device 50 are the same as those in the first embodiment. 【0381】 The game board 10C is basically the same as the game board 10 of the first embodiment, except that it does not include a reading device 20 (IC tag reader). 【0382】 The first image capturing device 30C-1 corresponds to the image capturing device 30 of the first embodiment and is a visible light camera. On the other hand, the second image capturing device 30C-2 is an invisible light camera (e.g., an infrared camera). The second image capturing device 30C-2 is used to read codes printed in invisible ink. "Invisible ink" refers to ink (e.g., infrared ink) that can be recognized by an image sensor by irradiating it with invisible light (e.g., infrared light). 【0383】 37 is a diagram illustrating an example of a sleeve 70C according to the fourth embodiment. Similar to the sleeve 70 according to the first embodiment, the front surface 71C of the sleeve 70C is transparent, allowing the front surface 61 of the card 60 housed in the sleeve 70C to be seen from outside the sleeve 70C. Also, similar to the sleeve 70 according to the first embodiment, the back surface 72C of the sleeve 70C is opaque, and the appearance of the back surface 72C visible to the human eye is the same for all sleeves 70C. 【0384】 The surface portion 71C of the sleeve 70C includes a first code 77C-1. The first code 77C-1 is printed in invisible ink on the outer surface of the surface portion 71C. Although the first code 77C-1 is printed in the center of the surface portion 71C in FIG. 37, the first code 77C-1 may be printed in a position other than the center. The first code 77C-1 is a code in which the sleeve ID of the sleeve 70C is embedded. That is, the first code 77C-1 is a code obtained by encoding the sleeve ID of the sleeve 70C in accordance with a predetermined standard (rule). In other words, the first code 77C-1 is a code including a pattern (a pattern unique to the sleeve ID) generated based on the sleeve ID of the sleeve 70C. The first code 77C-1 is, for example, a two-dimensional code (QR Code (registered trademark), etc.). The sleeve ID is information that uniquely identifies each individual sleeve 70C. 【0385】 Additionally, the back surface 72C of the sleeve 70C includes a second code 77C-2. The second code 77C-2 is printed in invisible ink on the outer surface of the back surface 72C. Like the first code 77C-1, the second code 77C-2 is also a code in which the sleeve ID of the sleeve 70C is embedded. That is, the sleeve ID of the sleeve 70C is embedded in both the first code 77C-1 and the second code 77C-2. 【0386】 In the following, the first cord 77C-1 and the second cord 77C-2 may be collectively referred to as "cord 77C." In the following, the card 60 housed in the sleeve 70C will be referred to as "card 60SC" for convenience in order to distinguish it from the card 60 alone. In other words, when the card 60 is housed in the sleeve 70C, the card 60 and the sleeve 70C will be regarded as a single object and will be referred to as "card 60SC." 【0387】 Like the first camera 30C-1, the second camera 30C-2 is fixed above the game field F. The image captured by the second camera 30C-2 also includes at least zones Z1 to Z30 of the game field F. 【0388】 For example, the second photographing device 30C-2 includes a light source that irradiates the game field F with invisible light, and an image sensor that captures the light reflected by the game field F or a card 60SC placed on the game field F, converts it into an electronic image signal, and outputs it. The image sensor is configured to receive reflected light from which visible light (external light) has been removed. The second photographing device 30C-2 is used to read the first code 77C-1 or the second code 77C-2 of the card 60SC placed on the game field F. 【0389】 The second camera 30C-2 and the information processing device 40 are connected via a cable conforming to a predetermined interface standard. Alternatively, the second camera 30C-2 and the information processing device 40 can communicate with each other via a communication network. The second camera 30C-2 captures images of the game field F at predetermined time intervals, and the captured images are supplied to the information processing device 40 via the cable or communication network. 【0390】 When the game field F is placed face up on the card 60SC, the image captured by the second photographing device 30C-2 includes the first code 77C-1 on the obverse portion 71C of the card 60SC, and the information embedded in the first code 77C-1 (sleeve ID) is acquired based on the captured image. On the other hand, when the game field F is placed face down on the card 60SC, the image captured by the second photographing device 30C-2 includes the second code 77C-2 on the reverse portion 72C of the card 60SC, and the information embedded in the second code 77C-2 (sleeve ID) is acquired based on the captured image. 【0391】 [4-2. Processing] The processing executed by the system 1C according to the fourth embodiment will be described. 【0392】 [4-2-1] Figure 38 shows an example of the association process of the fourth embodiment. For example, a player places one card 60SC from his / her deck vertically and face up in a predetermined zone Z (e.g., zone Z11) on the game field F. In this state, the association process shown in Figure 38 is executed. 【0393】 38, first, control unit 41 of information processing device 40 acquires an image captured by first photographing device 30C-1 (S400C). Then, control unit 41 identifies the card ID of card 60SC shown in the captured image from the captured image (S402C). Steps S400C and S402C are similar to steps S400 and S402 in FIG. 【0394】 The control unit 41 also acquires an image captured by the second photographing device 30C-2 (S404C). Then, the control unit 41 acquires a sleeve ID from the first code 72C-1 shown in the captured image (S406C). Then, the control unit 41 registers an association between the card ID identified in step S402C and the sleeve ID acquired in step S406C in association data D1C (S408C). 【0395】 Fig. 39 shows an example of association data D1C in the fourth embodiment. As shown in Fig. 39, the association data D1C includes "card ID" and "sleeve ID" fields. The "card ID" field is the same as the "card ID" field in the association data D1 in the first embodiment. The "sleeve ID" field is a field for registering a sleeve ID. 【0396】 In step S408C, the control unit 41 adds a new record to the association data D1C and registers the card ID identified in step S402C and the sleeve ID obtained in step S406C in the "card ID" and "sleeve ID" fields of the record. 【0397】 After step S408C is executed, a completion notice is output indicating that the association process is complete, and the player removes card 60SC placed in zone Z and places the next card 60SC from his or her deck vertically and face up in zone Z. In this state, the association process shown in FIG. 38 is executed again. 【0398】 38 is executed for each card 60SC included in the deck of the first player, whereby information on all cards 60SC included in the deck of the first player is registered in the association data D1C. Also, for each card 60SC included in the deck of the second player, the association process shown in FIG. 38 is executed for each card 60SC included in the deck of the second player, whereby information on all cards 60SC included in the deck of the second player is registered in the association data D1C. 【0399】 [4-2-2] Fig. 40 shows an example of the identification process of the fourth embodiment. As shown in Fig. 40, first, the control unit 41 of the information processing device 40 acquires an image captured by the first photographing device 30C-1 (S430C). Then, the control unit 41 identifies the position and orientation of the card 60SC from the captured image (S432C). The processes of steps S430C and S432C are the same as steps S430 and S432 of Fig. 13. The identification result in step S432C is registered in first identification result data D2. The first identification result data D2 is the same as in the first embodiment. 【0400】 After executing step S432C, the control unit 41 acquires an image captured by the second image capturing device 30C-2 (S434C), and the control unit 41 identifies the position and card ID of the card 60SC from the captured image (S436C). 【0401】 For example, the control unit 41 determines whether or not the code 77C (the first code 77C-1 or the second code 77C-2) is present in each of the areas A1 to A30 of the captured image. The control unit 41 also acquires the sleeve ID from the code 77C that is present. 【0402】 The identification result in step S436C is registered in second identification result data D3C. FIG. 41 shows an example of the second identification result data D3C. As shown in FIG. 41, the second identification result data D3C includes "area ID" and "card ID" fields. The "area ID" field is similar to the "area ID" field in the first identification result data D2 of the first embodiment, and the "card ID" field is similar to the "card ID" field in the second identification result data D3 of the first embodiment. 【0403】 For example, if the code 77C is captured in the area A10, the control unit 41 registers the sleeve ID acquired from the code 77C in the "card ID" field of the record for the area ID "A10." 【0404】 After executing step S436C, the control unit 41 generates game field situation data D4 based on the first identification result data D2 and the second identification result data D3C (S438C). The game field situation data D4 is the same as in the first embodiment. 【0405】 7, a deck of cards 600-1 (i.e., a plurality of cards 60SC stacked face down) is placed in zone Z7. In the fourth embodiment, however, only the second code 77C-2 of the top card 60SC of the deck of cards 600-1 placed in zone Z7 appears in the image captured by the second photographing device 30C-2. Therefore, only the card ID of the top card 60SC of the deck of cards 600-1 placed in zone Z7 is registered in the "card ID" field of the record for area ID "A7" in the second identification result data D3C and the record for zone ID "Z7" in the game field situation data D4. The same applies to zones Z1, Z15, and Z21. 【0406】 [4-2-3] In the fourth embodiment as well, the display control process shown in Fig. 18 and the process shown in Fig. 19 are executed. However, in the parts PA-1 to PA-4 of the game field image G in the fourth embodiment, the numbers indicating the number of cards 60SC included in the card stacks 600-1 to 600-4 are not displayed. 【0407】 [4-3. Effects] According to the fourth embodiment, when the card 60SC is placed face up on the game field F, the first code 77C-1 on the front surface 71C of the card 60SC is photographed by the second photographing device 30C-2, allowing the information embedded in the first code 77C-1 to be read, and as a result, the card ID of the card 60SC can be obtained. On the other hand, when the card 60SC is placed face down on the game field F, the second code 77C-2 on the back surface 72C of the card 60SC is photographed by the second photographing device 30C-2, allowing the information embedded in the second code 77C-2 to be read, and as a result, the card ID of the card 60SC can be obtained. Thus, according to the fourth embodiment, the card ID of the card 60SC can be obtained whether the card 60SC is placed face up or face down. 【0408】 According to the fourth embodiment, even if the card 60SC is placed face down on the game field F (i.e., the card 60SC is placed on the game field F with the front surface 61 not visible), the information written on the front surface 61 of the card 60 (such as the name and performance of the card 60) can be identified based on the information stored in the second code 77C-2 on the back surface 72C of the card 60SC. 【0409】 Furthermore, according to the fourth embodiment, because the code 77C is printed on the sleeve 70C, even if the code 77C is not printed on the card 60 itself, by storing the card 60 in the sleeve 70C and using it, it is possible to identify the type and condition of the card 60 based on the image captured by the second photographing device 30C-2. In other words, because the code 77C does not need to be printed on the card 60 itself, it is possible to use, for example, an existing card 60 that does not have the code 77C printed on it. 【0410】 Furthermore, according to the fourth embodiment, the code 77C is printed in an invisible state so that it cannot be seen by people, and therefore it is possible to prevent the appearance of the card 60SC (card 60) from being impaired when seen by people. Furthermore, when the card 60SC is placed face down on the game field F, it is possible to prevent an opponent from relying on the second code 77C-2 printed on the back surface 72C to figure out the name, performance, etc. of the card 60 that they would not normally be able to figure out. 【0411】 [4-4. Modifications] Modifications of the fourth embodiment will now be described. 【0412】 [4-4-1] For example, the first code 77C-1 may be embedded with information indicating that it is a code printed on the front surface 71C together with the sleeve ID. The second code 77C-2 may be embedded with information indicating that it is a code printed on the back surface 72C together with the sleeve ID. 【0413】 Specifically, the first code 77C-1 may be embedded with the sleeve ID as a front / back flag "0" indicating that it is the front side, and the second code 77C-2 may be embedded with the sleeve ID as a front / back flag "1" indicating that it is the back side.Then, the sleeve ID and the front / back flag may be obtained from the code 77C shown in the image captured by the second image capturing device 30C-2. 【0414】 In this way, when the card 60SC is placed face up, it is possible to identify that the card 60SC is placed face up by obtaining "0" as the front / back flag from the first code 77C-1, and when the card 60SC is placed face down, it is possible to identify that the card 60SC is placed face down by obtaining "1" as the front / back flag from the second code 77C-2. In other words, the front / back orientation of the card 60SC can be identified based on the image captured by the second photographing device 30C-2. In other words, the state of the card 60SC can be identified based on the image captured by the second photographing device 30C-2. 【0415】 [4-4-2] For example, similar to the first IC tag 73-1 and the second IC tag 73C-2 of the second embodiment, a plurality of codes 77C having a predetermined positional relationship may be printed on the back surface 72C. When the card 60SC is placed face down, the vertical and horizontal orientation of the card 60SC may be identified based on the positional relationship of the plurality of codes 77C that appear in the image captured by the second photographing device 30C-2. 【0416】 Furthermore, a plurality of codes 77C having a predetermined positional relationship may also be printed on the obverse portion 71C. When the card 60SC is placed face up, the vertical and horizontal orientation of the card 60SC may be identified based on the positional relationship of the plurality of codes 77C that appear in the image captured by the second photographing device 30C-2. 【0417】 In this way, the vertical and horizontal orientation of the card 60SC can be identified based on the image captured by the second photographing device 30C-2. 【0418】 [4-4-3] For example, the card ID of the card 60 may be embedded in the first code 77C-1 and the second code 77C-2. 【0419】 [4-5. Functional Elements] Fig. 42 is a functional block diagram for explaining the functional elements included in the system 1C according to the fourth embodiment. In Fig. 42, the same functional elements as those in the first embodiment (the display control unit 160 and the display unit 170) are assigned the same reference numerals as those in Fig. 22, and explanations of these functional elements will be omitted here. Also, explanations of wording that overlap with those in the first embodiment will be omitted. 【0420】 [4-5-1] First, the object 100C will be described. The object 100C is an object in which a play medium is housed in a container. 【0421】 The game medium has a surface (hereinafter referred to as a "characteristic surface" for convenience) that has an appearance that corresponds to the type of game medium. For example, the characteristic surface is a surface that has an appearance that is unique to the type of game medium. Also, for example, the characteristic surface is a surface on which text or a design that corresponds to the type of game medium is written. 【0422】 The container includes a first surface and a second surface. These first and second surfaces are the same as the first and second surfaces described as being included in the container (object 100) in the first embodiment. When the play medium is contained in the container, the first surface (the inner surface of the first surface) faces the characteristic surface of the play object. For example, all or part of the first surface is formed using a transparent material (such as a transparent film), and the first surface is configured so that the characteristic surface of the play object contained in the container can be seen through the first surface from outside the container. 【0423】 The object 100C includes a first holding portion 101C and a second holding portion 102C. The first holding portion 101C is provided on a first surface of the container. The first holding portion 101C is for holding first identification information for identifying the type or state of the game medium contained in the container. 【0424】 For example, first identification information is written on the first surface of the object 100C (container) in an invisible manner that cannot be seen by humans. In this case, the portion on which the first identification information is written in an invisible manner corresponds to the first holding portion 101C. For example, the first identification information is written on the first surface using invisible ink. Note that the first identification information is written on the outer surface of the first surface, for example. 【0425】 The "first identification information" is information that serves as the basis for identifying at least one of the type and condition of the game medium contained in the container. In other words, the "first identification information" includes at least one of information that serves as the basis for identifying the type of game medium contained in the container and information that serves as the basis for identifying the condition of the game medium contained in the container. 【0426】 For example, if there is data associating a container ID that uniquely identifies a container with the game medium ID of the game medium contained in the container, and the type of game medium contained in the container can be identified based on the container ID, the "first identification information" includes the container ID as "information that serves as the basis for identifying the type of game medium contained in the container." Also, for example, the "first identification information" may include the game medium ID that uniquely identifies the type of game medium. 【0427】 Furthermore, for example, the "first identification information" may include first identification information identifying the first holding unit 101C as "basic information for identifying the state of the play medium contained in the container." For example, when the first identification information stored in the first holding unit 101C of the first surface unit is read, it is identified that the object 100C is placed on the target surface with the second surface unit and the target surface in contact. For this reason, the "first identification information" may include the first identification information identifying the first holding unit 101C as "basic information for identifying the arrangement format of the object 100C (whether the object 100C is placed on the target surface with the second surface unit and the target surface in contact)." 【0428】 On the other hand, the second holding section 102C is provided on the second surface of the container, and is for holding second identification information for identifying the type or state of the game medium contained in the container. 【0429】 For example, second identification information is written on the second surface of the object 100C (container) in an invisible manner that cannot be seen by humans. In this case, the portion on which the second identification information is written in an invisible manner corresponds to the second holding portion 102C. For example, the second identification information is written on the second surface using invisible ink. Note that the second identification information is written on the outer surface of the second surface, for example. 【0430】 Like the first identification information, the "second identification information" is information that serves as the basis for identifying at least one of the type and state of the game medium contained in the container. 【0431】 For example, the "second identification information" includes the container ID of the container or the game medium ID of the game medium contained in the container as "basic information for identifying the type of game medium contained in the container." 【0432】 Furthermore, for example, the "second identification information" may include second identification information that identifies the second holding unit 102C as "basic information for identifying the state of the object 100C." For example, when the second identification information stored in the second holding unit 102C of the second surface unit is read, it is identified that the object 100C is placed on the object surface with the first surface unit and the object surface in contact with each other. For this reason, the "second identification information" may include the second identification information that identifies the second holding unit 102C as "basic information for identifying the arrangement format of the object 100C (whether the object 100C is placed on the object surface with the first surface unit and the object surface in contact with each other)." 【0433】 In addition, if each of the first identification information and the second identification information includes only "basic information for identifying the type of game medium contained in the container," the first identification information and the second identification information will be the same information. 【0434】 The first and second surfaces of the container are positioned such that when the object 100C is placed on the target surface with the outer surface of the first surface in contact with the target surface, the second identification information held in the second holding portion 102C of the second surface can be read by the reading unit 130C, and when the object 100C is placed on the target surface with the outer surface of the second surface in contact with the target surface, the first identification information held in the first holding portion 101C of the first surface can be read by the reading unit 130C. 【0435】 For example, the first and second surfaces of the container are positioned such that when the object 100C is placed on the object surface so that the outer surface of the first surface is in contact with the object surface, the outer surface of the second surface faces upward, making it possible to read the second specific information held in the second holding portion 102C of the second surface via a device installed above the object surface; and when the object 100C is placed on the object surface so that the outer surface of the second surface is in contact with the object surface, the outer surface of the first surface faces upward, making it possible to read the first specific information held in the first holding portion 101C of the first surface via a device installed above the object surface. 【0436】 In the example of the card game mentioned above, the card 60SC corresponds to an example of the object 100C, the card 60 corresponds to an example of a “play medium,” and the sleeve 70C corresponds to an example of a “container.” Also, the front surface 71C and the back surface 72C of the sleeve 70C correspond to an example of a “first surface” and a “second surface.” 【0437】 Furthermore, the first code 77C-1 and the second code 77C-2 correspond to an example of the first holding unit 101C and the second holding unit 102C. The sleeve ID corresponds to an example of the "first identification information" and the "second identification information." In addition, in the case of a modified example in which a front / back flag is embedded in each of the first code 77C-1 and the second code 77C-2, the front / back flag also corresponds to an example of the "first identification information" and the "second identification information." 【0438】 [4-5-2] The first image capturing unit 110C is realized by the first image capturing device 30C-1. The first image capturing unit 110C captures an image of the target surface on which the target object 100C is placed. For example, the first image capturing unit 110C captures the target surface from above the target surface. The first image capturing unit 110C may be capable of capturing an image of the entire target surface, or may be capable of capturing an image of only an area of ​​the target surface where the target object 100C may be placed. The first captured image acquiring unit 120C acquires an image captured by the first image capturing unit 110C. 【0439】 [4-5-3] The second image capturing unit 180C is realized by the second image capturing device 30C-2. The second image capturing unit 180C captures an image of the target surface on which the object 100C is placed. The second image capturing unit 180C includes a light source that irradiates the target surface with invisible light and an image sensor that captures the light (invisible light) reflected by the target surface or the object 100C placed on the target surface, converts it into an electronic image signal, and outputs it. For example, the second image capturing unit 180C captures the target surface from above the target surface. The second image capturing unit 180C may be capable of capturing the entire target surface, or may be capable of capturing only an area of ​​the target surface where the object 100C may be placed. The second captured image acquiring unit 190C acquires the image captured by the second image capturing unit 180C. 【0440】 [4-5-4] The reading unit 130C reads the first identification information stored in the first storage unit 101C. The reading unit 130C reads the first identification information based on the image captured by the second imaging unit 180C. The reading unit 130C also reads the second identification information stored in the second storage unit 102C. The reading unit 130C reads the second identification information based on the image captured by the second imaging unit 180C. 【0441】 When the object 100C (container) is placed on the object surface so that the first surface thereof contacts the object surface, the second identification information held in the second holding portion 102C of the second surface of the object 100C can be read by the reading unit 130C. On the other hand, when the object 100C (container) is placed on the object surface so that the second surface thereof contacts the object surface, the first identification information held in the first holding portion 101C of the first surface of the object 100C can be read by the reading unit 130C. 【0442】 In the example of the card game described above, when the card 60SC is placed face up, the first code 77C-1 appears in the image captured by the second photographing device 30C-2, so the reading unit 130C reads the sleeve ID (or front / back flag) embedded in the first code 77C-1. On the other hand, when the card 60SC is placed face down, the second code 77C-2 appears in the image captured by the second photographing device 30C-2, so the reading unit 130C reads the sleeve ID (or front / back flag) embedded in the second code 77C-2. 【0443】 [4-5-5] The identification unit 150C identifies the position and state of the object 100C based on the image captured by the first imaging unit 110C and the reading result by the reading unit 130C. The identification unit 150C includes a first identification unit 151C and a second identification unit 152C. 【0444】 For example, the first identification unit 151C identifies the position and orientation of the object 100C based on the image captured by the first imaging unit 110C. The second identification unit 152C identifies the position and type of the object 100C based on the reading result of the reading unit 130C. The second identification unit 152C may also identify the position, type, and orientation of the object 100C based on the reading result of the reading unit 130C. 【0445】 In the example of the card game described above, the first identification unit 151C identifies the position, vertical and horizontal orientation, and front and back orientation of the card 60SC based on the image captured by the first photographing unit 110C. The second identification unit 152C identifies the position and card ID of the card 60SC based on the reading result of the reading unit 130C. 【0446】 [4-5-6] The second surface of the target object 100C (container) may include a third holding portion provided so as to have a predetermined positional relationship with the second holding portion 102C. 【0447】 That is, as in the modified example described above, multiple codes 77C may also be printed on the back surface 72C, similar to the first IC tag 73A-1 and the second IC tag 73A-2 of the second embodiment. That is, the back surface 72C may include, in addition to the second code 77C-2, a third code (an example of a third holding portion) having a predetermined positional relationship with the second code 77C-2. 【0448】 In this case, similar to the first IC tag 73A-1 and the second IC tag 73A-2 of the second embodiment, the second code 77C-2 and the third code are arranged at different positions on the outer surface of the back surface 72C. The second code 77C-2 and the third code are arranged at positions such that the orientation of the card 60SC can be identified from the positional relationship between the second code 77C-2 and the third code when the card 60SC is placed face up on the game field. 【0449】 In this way, when the card 60SC is placed face down, the length and width of the card 60SC can be identified based on the relative positions of the second code 77C-2 and the third code. The same applies to the surface portion 71C. 【0450】 [5. Modifications] The present invention is not limited to the first to fourth embodiments described above. 【0451】 [5-1] For example, the second embodiment and the third embodiment may be combined. That is, one sleeve may be provided with an IC tag for identifying the vertical and horizontal orientation in addition to an IC tag for identifying the front and back orientation. For example, one sleeve may be provided with three or four or more IC tags. In this case, the photographing device 30 is not necessarily required to identify the position and state (position, vertical and horizontal orientation, front and back orientation) of the card 60. 【0452】 For example, as in the sleeve 70A shown in Figure 23, a first IC tag and a second IC tag corresponding to the first IC tag 73A-1 and the second IC tag 73A-2 may be provided on the inner surface of the back surface of the sleeve, and further, a blocking surface portion corresponding to only the lower half of the blocking surface portion 74B shown in Figure 29 may also be provided within the sleeve, and a third IC tag corresponding to the first IC tag 73B-1 shown in Figure 29 may be provided on the surface of the blocking surface portion corresponding to the first surface 75B shown in Figure 29. 【0453】 In this case, because there is a blocking surface between the second IC tag and the third IC tag present in the lower half of the sleeve, when the card 60 housed in the sleeve is placed face up on the game field F, the signal from the second IC tag is received by the reader 20 but the signal from the third IC tag is not received by the reader 20, and when the card 60 housed in the sleeve is placed face down on the game field F, the signal from the third IC tag is received by the reader 20 but the signal from the second IC tag is not received by the reader 20. As a result, depending on whether the signal from the second IC tag or the third IC tag is received by the reader 20, it can be determined whether the card 60 housed in the sleeve is placed face up or face down. 【0454】 In this case, the first IC tag present in the upper half of the sleeve is not affected by the blocking surface, and therefore, whether the card 60 accommodated in the sleeve is placed on the game field F face up or face down, the signal from the first IC tag is received by the reader 20. As a result, when the card 60 accommodated in the sleeve is placed face up, the signals from the first IC tag and the second IC tag are received by the reader 20, and the positions of the first IC tag and the second IC tag can be identified, and the vertical and horizontal orientation of the card 60 can be determined from the positional relationship between the first and second IC tags. On the other hand, when the card 60 accommodated in the sleeve is placed face down, the signals from the first and third IC tags are received by the reader 20, and the positions of the first and third IC tags can be identified, and the vertical and horizontal orientation of the card 60 can be determined from the positional relationship between the first and third IC tags. 【0455】 In this way, by using a sleeve equipped with three IC tags (first to third IC tags) as described above, the front and back orientation of the card 60 placed on the game field F can be identified based on the reading results of the reading device 20, and regardless of whether the card 60 is placed face up or face down, the vertical and horizontal orientation of the card 60 can be identified based on the reading results of the reading device 20. 【0456】 23 on each of the first surface 75B of the blocking surface portion 74B in the sleeve 70B shown in Fig. 29 and the second surface 75B of the blocking surface portion 74B (or the inner surface of the back surface portion 72B of the sleeve 70B), thereby providing four IC tags in one sleeve. Even in this way, the front and back orientation of the card 60 placed on the game field F can be identified based on the reading result of the reading device 20, and the vertical and horizontal orientation of the card 60 can be identified based on the reading result of the reading device 20 regardless of whether the card 60 is placed face up or face down. 【0457】 [5-2] For example, any of the first to third embodiments may be combined with the fourth embodiment. That is, both the IC tag and the invisible code may be provided on the sleeve (or card 60). 【0458】 [5-3] Although the above description has focused on card games, the present invention can also be applied to games other than card games. The present invention can also be applied to games played using objects placed on an object surface. 【0459】 [6. Supplementary Note] From the above description, the present invention can be understood, for example, as follows: In order to facilitate understanding of the present invention, reference numerals shown in the drawings are written in parentheses as appropriate, but this does not mean that the present invention is limited to the illustrated embodiments. 【0460】 A1) An identification system (1, 1A, 1B) according to one embodiment of the present invention is an identification system for identifying the type and state of an object (100, 100A, 100B) placed on an object surface (e.g., a game field F) in a game played using the object placed on the object surface, and includes: an imaging means (110) for photographing the object surface on which the object is placed; a reading means (130) for reading information stored in an IC tag (73, 73A-1, 73A-1, 73B-1, 73B-2) attached to the object; and an identification means (150, 150A, 150B) for identifying the type and state of the object placed on the object surface based on the image captured by the imaging means and the reading result of the reading means. 【0461】 A12) An identification device (40) according to one embodiment of the present invention is an identification device (40) for identifying the type and state of an object (100, 100A, 100B) placed on an object surface (e.g., a game field F) in a game played using the object placed on the object surface, and includes: an image acquisition means (120) for acquiring an image captured by an imaging means (110) that captures an image of the object surface on which the object is placed; a reading result acquisition means (140) for acquiring a reading result by a reading means (130) that reads information stored in an IC tag (73, 73A-1, 73A-1, 73B-1, 73B-2) provided on the object; and an identification means (150) for identifying the type and state of the object placed on the object surface based on the image captured by the imaging means and the reading result of the reading means. 【0462】 A13) A program according to one aspect of the present invention is a program for causing a computer to function as the specific system (1) described in any one of A1) to A11) or the specific device (40) described in A12). 【0463】 A14) An identification method according to one aspect of the present invention is a method for identifying the type and state of an object (100, 100A, 100B) placed on an object surface (e.g., a game field F) in a game played using the object placed on the object surface, and includes a step (S430) in which a photographed image acquisition means (120) acquires a photographed image of a photographing means (110) that photographs the object surface on which the object is placed, a step (S434) in which a reading result acquisition means (140) acquires a reading result of a reading means (130) that reads information stored in an IC tag (73, 73A-1, 73A-1, 73B-1, 73B-2) provided on the object, and identification steps (S432, S436) in which an identification means (150) identifies the type and state of the object placed on the object surface based on the photographed image of the photographing means and the reading result of the reading means. 【0464】 A15) An information storage medium according to one aspect of the present invention is a computer-readable information storage medium having the program according to A13) recorded thereon. 【0465】 According to the inventions described in A1), A12) to A15), the type and state of an object placed on an object surface can be identified using not only an image captured by a photographing means that captures an image of the object surface on which the object is placed, but also the read result by a reading means that reads information stored in an IC tag provided on the object. According to the inventions described in A1), A12) to A15), matters that cannot be identified (or are difficult to identify) from an image captured by a photographing means can be identified based on the read result by a reading means. 【0466】 A2) In one aspect of the present invention, the device may further include a means (160) for displaying on a display means (170) an object (e.g., PB-1, PB-2) corresponding to the type of object identified by the identification means (150, 150A, 150B) in a state corresponding to the state of the object identified by the identification means (150, 150A, 150B). 【0467】 According to the invention described in A2), an object corresponding to the type of object placed on the target surface is displayed on the display means in a state corresponding to the state of the object placed on the target surface, making it easier for people (spectators, etc.) looking at the display means to understand the current situation of the game. 【0468】 A3) In one aspect of the present invention, the device may further include a means (160) for displaying on a display means (170) an object corresponding to the type of object identified by the identification means (150, 150A, 150B) in accordance with the state of the object identified by the identification means (150, 150A, 150B). 【0469】 According to the invention described in A3), for example, it is possible to determine whether or not to display an object corresponding to the type of object identified by the identification means, depending on the state of the object identified by the identification means. For example, it is possible to display an object corresponding to the type of object identified by the identification means as an object corresponding to the object, or not to display an object corresponding to the type of object identified by the identification means, depending on the state of the object identified by the identification means. 【0470】 A4) In one aspect of the present invention, the object has a writing surface (e.g., 61) on which information is written, and the identification means (150, 150A, 150B) may further include a display control means (160) that identifies the type of the object placed on the object surface based on the information read by the reading means (130), identifies the information written on the writing surface of the object placed on the object surface based on the identification result, and causes a display means (170) to display a display corresponding to the information written on the writing surface of the object identified by the identification means when the object is placed on the object surface with the writing surface facing the object surface. 【0471】 According to the invention described in A4), even when an object is placed on the object surface with the writing surface facing the object surface (that is, when the object is placed on the object surface in a manner that the information written on the writing surface cannot be seen), a display corresponding to the information written on the writing surface of the object is displayed on the display means, so that a person (audience, etc.) looking at the display means can be provided with a new interest in being able to learn things that would not normally be known to them. 【0472】 A5) In one aspect of the present invention, the display control means (160) includes means for displaying on the display means (170) an object (e.g., PB-1, PB-2) corresponding to the object placed on the object surface, and when the object is placed on the object surface with the writing surface and the object surface facing each other, and a predetermined operation related to the object corresponding to the object is accepted, the display means (170) may be configured to display a display (e.g., PC) corresponding to the information written on the writing surface of the object. 【0473】 According to the invention described in A5), when an object is placed on the object surface with the writing surface and the object surface facing each other (i.e., when the object is placed on the object surface in a manner that the information written on the writing surface cannot be seen), and a predetermined operation regarding an object corresponding to the object is received, a display corresponding to the information written on the writing surface of the object is displayed on the display means. Therefore, for example, matters that would not normally be known cannot be known in principle, but can be known by performing a predetermined operation only when desired by a person viewing the display means (such as a spectator). 【0474】 A6) In one aspect of the present invention, the identification means (150, 150A, 150B) may be configured to identify the type of a first object placed on the object surface with a second object stacked on top of it, based on the information read by the reading means (130) from the IC tag of the first object. 【0475】 According to the invention described in A6), even if a second object is stacked on top of the first object, the type of the first object can be identified. When a second object is stacked on top of the first object, it is difficult to identify the type of the first object from the captured image, but according to the present invention, the type of the first object can be identified. 【0476】 A7) In one aspect of the present invention, the reading means (130) is an antenna that receives a signal transmitted from the IC tag and includes a plurality of antennas (e.g., 20-10 to 20-30 or 21 and 22) that are installed to correspond to a plurality of positions on the target surface, and the identification means (150) may identify the position of the object placed on the target surface based on which of the plurality of antennas received the signal transmitted from the IC tag of the object placed on the target surface. 【0477】 According to the invention described in A7), the position of an object placed on a target surface can be identified based on which of multiple antennas received a signal transmitted from the IC tag of the object placed on the target surface. For example, while it is possible to identify the position of an object placed on a target surface from a photographed image, according to the invention described in A7), the position of an object placed on a target surface can be identified not only from a photographed image but also from which of multiple antennas received a signal transmitted from the IC tag of the object placed on the target surface. By comparing these, the accuracy of the results of identifying the position of an object placed on the target surface can be improved. Furthermore, by comparing these, even when multiple objects are placed on the target surface, it can be identified that the identification result based on the image captured by the photographing means and the identification result based on the read result by the reading means relate to the same object placed on the target surface. 【0478】 A8) In one aspect of the present invention, the object (100B) has a first surface portion (e.g., 71B) and a second surface portion (e.g., 72B), and the object is equipped with a first IC tag (e.g., 73B-1), a second IC tag (e.g., 73B-2), and a restriction portion (103B) that restricts communication between the first IC tag and the reading means (130) from being performed via the second surface portion and restricts communication between the second IC tag and the reading means from being performed via the first surface portion, the first IC tag is arranged between the first surface portion and the restriction portion, and the second IC tag is arranged between the second surface portion and the restriction portion, and the identification portion (150B) may be configured to identify whether the object is placed on the object surface with either the first surface portion or the second surface portion facing the object surface based on the result of the reading means reading the information stored in the first IC tag or the second IC tag. 【0479】 According to the invention described in A8), it is possible to identify whether an object is placed on a target surface with its first surface (e.g., its front surface) facing the target surface, or whether its second surface (e.g., its back surface) facing the target surface, based on the results of reading information stored in a first IC tag and a second IC tag provided on the object. For example, it is possible to identify from a captured image which of the first surface or the second surface of the object is placed on the target surface so as to face the target surface. However, according to the invention described in A8), it is possible to identify not only from a captured image but also from the results of reading information stored in the first IC tag and the second IC tag provided on the object so as to face the target surface. Therefore, by comparing these, it is possible to improve the accuracy of the identification result of which of the first surface or the second surface of the object is placed on the target surface so as to face the target surface. 【0480】 A9) In one aspect of the present invention, the object (100A) comprises a first IC tag (e.g., 73A-1) and a second IC tag (e.g., 73A-2) arranged to have a predetermined positional relationship with the first IC tag, the reading means (130) is an antenna that receives signals transmitted from each of the first IC tag and the second IC tag, and includes a plurality of antennas (e.g., 21 and 22) installed to correspond to a plurality of positions on the object surface, respectively, and the identification means (150A) may be configured to identify the orientation of the object placed on the object surface based on which of the plurality of antennas received the signals transmitted from each of the first IC tag and the second IC tag of the object placed on the object surface. 【0481】 According to the invention described in A9), the orientation of an object placed on the object surface can be identified based on which of multiple antennas received the signals transmitted from each of the first IC tag and second IC tag of the object placed on the object surface. For example, although it is possible to identify the orientation of an object placed on the object surface from a photographed image, according to the invention described in A9), the orientation of an object placed on the object surface can be identified not only from the photographed image but also from which of multiple antennas received the signals transmitted from each of the first IC tag and second IC tag of the object, and by comparing these, the accuracy of the results of identifying the position of the object placed on the object surface can be improved. 【0482】 A10) In one aspect of the present invention, the identification means (150, 150A, 150B) includes a first identification means (151, 151A, 151B) that identifies the position and orientation of the object placed on the object surface based on the image captured by the imaging means (110), and a second identification means (152, 152A, 152B) that identifies the position and type of the object placed on the object surface based on the reading result of the reading means (130), and may be configured to identify a combination of the identification result of the first identification means and the identification result of the second identification means regarding the same object placed on the object surface based on the position identified by the first identification means and the position identified by the second identification means. 【0483】 According to the invention described in A10), even when a plurality of objects are placed on the target surface, it is possible to identify the combination of the identification result (position and orientation) of the first identification means and the identification result (position and type) of the second identification means for the same object. In other words, even when a plurality of objects are placed on the target surface, it is possible to identify the combination of type, position, and orientation for each individual object. 【0484】 A11) In one aspect of the present invention, the object may be a container (e.g., 70, 70A, 70B) equipped with the IC tag containing a play medium (e.g., 60), or an object (e.g., 80) equipped with the IC tag and a play medium (e.g., 60) contained in a container. 【0485】 According to the invention described in A11), it is possible to identify the type and condition of game media that do not have IC tags by using an identification means. In other words, it becomes possible to use game media that do not have IC tags. 【0486】 B1) A display control system (1, 1A, 1B, 1C) according to another aspect of the present invention is a display control system that causes a display means (170) to display a display (e.g., a PC) relating to an object (100, 100A, 100B, 100C) placed on an object surface (e.g., a game field F) in a game played using the object placed on the object surface, wherein the object includes a writing surface (e.g., 61) on which information is written, and the object further includes a holding unit (101, 101A, 102A, 101B, 102B) that holds specific information (e.g., a tag ID, a card ID, or a sleeve ID) for identifying the information written on the writing surface of the object. The display control system includes a reading means (130) that reads the specific information held in the holding part of the object placed on the object surface, an identification means (150, 150A, 150B, 150C) that identifies the information written on the writing surface of the object placed on the object surface based on the specific information read by the reading means, and a display control means (160) that causes the display means (170) to display a display (e.g., a PC) corresponding to the information written on the writing surface of the object identified by the identification means when the object is placed on the object surface with the writing surface facing the object surface. 【0487】 B7) A display control device (40 or 50) according to another aspect of the present invention is a display control device that causes a display means (170) to display a display (e.g., a PC) relating to an object (100, 100A, 100B, 100C) placed on an object surface (e.g., a game field F) in a game played using the object placed on the object surface, wherein the object includes a writing surface (e.g., 61) on which information is written, and the object further includes a storage unit (101, 101A, 102A, 101B, 102B) that stores specific information (e.g., a tag ID, a card ID, or a sleeve ID) for identifying the information written on the writing surface of the object, and the display control device The device includes an acquisition means (140, 150C) that acquires the reading result of a reading means (130, 130C) that reads the specific information held in the holding part of the object placed on a surface, an identification means (150, 150A, 150B, 150C) that identifies the information written on the writing surface of the object placed on the object surface based on the specific information read by the reading means, and a display control means (160) that causes the display means (170) to display a display (e.g., a PC, etc.) corresponding to the information written on the writing surface of the object identified by the identification means when the object is placed on the object surface with the writing surface facing the object surface. 【0488】 B8) A program according to another aspect of the present invention is a program for causing a computer to function as the display control system (1) described in any one of B1) to B6), or the display control device (40 or 50) described in B7). 【0489】 B9) A display control method according to another aspect of the present invention is a display control method for displaying on a display means (170) a display (e.g., a PC) relating to an object (100, 100A, 100B, 100C) placed on an object surface (e.g., a game field F) in a game played using the object placed on the object surface, wherein the object includes a writing surface (e.g., 61) on which information is written, and the object further includes a holding unit (101, 101A, 102A, 101B, 102B, 101C, 102C) that holds specific information (e.g., a tag ID, a card ID, or a sleeve ID) for identifying the information written on the writing surface of the object, and the display control method is performed by an acquisition means (140, 150C) that acquires information held in the holding unit of the object placed on the object surface. The method includes an acquisition step (S430, S434 or S430C, S436C) of acquiring a reading result of a reading means (130, 130C) that reads the specific information to be read, an identification step (S432, S436 or S432C, S436C) of an identification means (150, 150A, 150B, 150C) identifying the information written on the writing surface of the object placed on the object surface based on the specific information read by the reading means, and a display control step (S512) of a display control means (160) causing the display means (170) to display a display (e.g., a PC) corresponding to the information written on the writing surface of the object identified by the identification step when the object is placed on the object surface with the writing surface facing the object surface. 【0490】 B10) An information storage medium according to another aspect of the present invention is a computer-readable information storage medium having the program according to B8) recorded thereon. 【0491】 According to the inventions described in B1), B7) to B10), even when an object is placed on an object surface so that the writing surface of the object on which information is written faces the object surface (i.e., when the object is placed on the object surface without the information written on the writing surface being visible), a display corresponding to the information written on the writing surface of the object is displayed on the display means, thereby providing spectators looking at the display means with the excitement of being able to learn things that they would not normally be able to know, thereby increasing the excitement of watching the game as a spectator. 【0492】 B2) In one aspect of the present invention, the display control means (160) includes means for causing the display means (170) to display an object (e.g., PB-1, PB-2) corresponding to the object placed on the object surface, and when the object is placed on the object surface with the writing surface facing the object surface and a predetermined operation related to the object corresponding to the object is accepted, the display means may be configured to display a display (e.g., PC) corresponding to the information written on the writing surface of the object. 【0493】 According to the invention described in B2), when an object is placed on the object surface so that the written surface of the object on which information is written faces the object surface (i.e., when the object is placed on the object surface with the information written on the written surface not visible), and a predetermined operation related to an object corresponding to the object is accepted, a display corresponding to the information written on the written surface of the object is displayed on the display means, so that, for example, matters that should not be known in principle can be made to remain in a state where they cannot be known, and only when a spectator viewing the display means wishes to do so, a display corresponding to the information can be displayed on the display means by performing a predetermined operation. In other words, it is possible to prevent spectators who do not wish to know the matters from being notified. 【0494】 B3) In one aspect of the present invention, the holding units (101, 101A-1, 101A-2, 101B-1, 101B-2) may include IC tags (73, 73A-1, 73A-2, 73B-1, 73B-2) that store the specific information, and the reading means (130) may read the specific information stored in the IC tags. 【0495】 According to the invention described in B3), even if the object is placed on the object surface with the writing surface facing the object surface (i.e., the object is placed on the object surface without the information written on the writing surface being visible), the information written on the writing surface can be identified based on the specific information stored in the IC tag. 【0496】 B4) In one aspect of the present invention, the object (100B, 100C) includes the writing surface (e.g., 61) and a holding surface (e.g., 76B, 72C) equipped with the holding portion (101B-2, 101C-2), and the reading means (130, 130C) may be configured to read the specific information held in the holding portion of the holding surface of the object placed on the object surface with the writing surface facing the object surface. 【0497】 According to the invention described in B4), even when an object is placed on the object surface with the writing surface and the object surface facing each other (i.e., when the object is placed on the object surface without the information written on the writing surface being visible), the information written on the writing surface can be identified based on the information stored in the holding section on a surface (holding surface) different from the writing surface. 【0498】 B5) In one aspect of the present invention, the apparatus includes an imaging means (110, 110C) that images the object surface on which the object is placed, and the identification means (150B, 150C) includes a first identification means (151B, 151C) that identifies the position of the object placed on the object surface and whether the object is placed on the object surface so that the writing surface faces the object surface based on the image captured by the imaging means, and a second identification means (152B, 152C) that identifies the position of the object placed on the object surface and the information written on the writing surface of the object based on the reading result of the reading means (130, 130C), and may be configured to identify a combination of the identification result of the first identification means and the identification result of the second identification means regarding the same object placed on the object surface based on the position identified by the first identification means and the position identified by the second identification means. 【0499】 According to the invention described in B5), even when multiple objects are placed on the object surface, it is possible to identify the combination of the identification result of the first identification means (position, whether the writing surface is placed so that the writing surface faces the object surface) and the identification result of the second identification means (position, information written on the writing surface) for the same object. In other words, even when multiple objects are placed on the object surface, it is possible to identify the position, whether the writing surface is placed so that the writing surface faces the object surface, and information written on the writing surface for each individual object. 【0500】 B6) In one aspect of the present invention, the object may be a container (e.g., 70, 70A, 70B, 70C) having the holding portion (101, 101A, 102A, 101B, 102B, 101C, 102C) in which a play medium (e.g., 60) is contained, or an object (e.g., 80) having the holding portion and a play medium (e.g., 60) are contained in a container. 【0501】 According to the invention described in B6), even game media that do not have a holding unit can be identified by the identifying means. In other words, game media that do not have a holding unit can be used. 【0502】 C1) A container (e.g., 70, 70A, 70B) according to another embodiment of the present invention is a container for containing individual game media used in a game played using game media (e.g., 60) placed on a target surface (e.g., game field F), and includes an IC tag (e.g., 73, 73A-1, 73A-2, 73B-1, 73B-2) for holding specific information (e.g., tag ID or card ID) for identifying the type or state of the game media placed on the target surface while contained in the container. 【0503】 According to the invention described in C1), an IC tag for holding specific information for identifying the type or state of the play medium placed on the target surface while contained in the container is provided on the container or the object contained in the container together with the play medium.Therefore, by using the play medium while contained in the container and reading the specific information held in the IC tag with an IC tag reader, the type or state of the play medium placed on the target surface while contained in the container can be identified based on the read specific information. 【0504】 Furthermore, according to the invention described in C1), there is no need for the gaming medium itself to be equipped with a special mechanism to identify (or make it easier to identify) the type or state of the gaming medium placed on the target surface, and existing gaming media (gaming media that do not have the above-mentioned special mechanism) can also be used in the game. 【0505】 In this way, according to the invention described in C1), it is possible to identify (or make it easier to identify) the type or state of the play medium placed on the target surface in the real world, while making it possible to use existing play objects in games. 【0506】 C2) In one aspect of the present invention, the play medium (e.g., 61) includes a writing surface (e.g., 61) on which information is written, and the container (e.g., 70, 70A, 70B) includes an opposing surface portion (e.g., 71, 71A, 71B) that faces the writing surface when the play medium is contained in the container, and is configured so that the writing surface of the play medium contained in the container can be seen from outside the container through the opposing surface portion, and the IC tag (e.g., 73, 73A-1, 73A-2, 73B-1, 73B-2) is provided at a position other than the opposing surface portion. 【0507】 According to the invention described in C2), since the IC tag is provided at a position other than the opposing surface portion, it is possible to prevent the information written on the writing surface of the play medium contained in the container from being obscured by the IC tag and becoming difficult to read. 【0508】 C3) In one aspect of the present invention, the container (e.g., 70, 70A, 70B) may include an opposite surface portion (e.g., 72, 72A, 72B) opposite the facing surface portion, and the IC tag (e.g., 73, 73A-1, 73A-2, 73B-1, 73B-2) may be provided on the opposite surface portion. 【0509】 According to the invention described in C3), the IC tag is provided on the opposite surface portion opposite the facing surface portion, thereby preventing the information written on the writing surface of the play medium contained in the container from being obscured by the IC tag and becoming difficult to read. 【0510】 C4) In one aspect of the present invention, the opposite surface (for example, 72, 72A, 72B) may have a common appearance with the opposite surface of another container. 【0511】 According to the invention described in C4), it is possible to ensure that the individual containers cannot be distinguished from the opposite side portion where the IC tag is provided. 【0512】 C5) In one aspect of the present invention, the device may include a first IC tag (e.g., 73A-1) and a second IC tag (e.g., 73A-2) arranged to have a predetermined positional relationship with the first IC tag. 【0513】 According to the invention described in C5), the orientation of a play medium placed on a target surface while housed in a container can be identified. That is, by providing one or more antennas corresponding to multiple positions on the target surface as antennas for receiving signals transmitted from the first IC tag and the second IC tag, the positions of the first IC tag and the second IC tag can be identified based on the antenna position at which the signal transmitted from each of the first IC tag and the second IC tag of the container placed on the target surface is received, and the orientation of the container (play medium housed in the container) placed on the target surface can be identified based on the positional relationship between the first IC tag and the second IC tag. 【0514】 C6) In one aspect of the present invention, a device includes a first surface (e.g., 71B), a second surface (e.g., 72B), a first IC tag (e.g., 73B-1), a second IC tag (e.g., 73B-2), and a restriction unit (103B: e.g., 74B) that restricts communication between a reading means (130: e.g., 20-1 to 20-30) for reading the specific information held in the first IC tag or the second IC tag and the first IC tag from being performed via the second surface, and restricts communication between the reading means (130) and the second IC tag from being performed via the first surface, and the first IC tag may be arranged between the first surface and the restriction unit, and the second IC tag may be arranged between the second surface and the restriction unit. 【0515】 According to the invention described in C6), it is possible to determine whether a game medium contained in a container is placed on a target surface with either the first surface or the second surface of the container in contact with the target surface based on the results of reading the specific information held in the first IC tag and the second IC tag. For example, when the reading means is disposed below the target surface and the game medium contained in the container is placed on the target surface with the first surface of the container in contact with the target surface, the specific information held in the first IC tag of the first IC tag and the second IC tag is read by the reading means. On the other hand, when the game medium contained in the container is placed on the target surface with the second surface of the container in contact with the target surface, the specific information held in the second IC tag of the first IC tag and the second IC tag is read by the reading means. Therefore, according to the invention described in C6), depending on whether the specific information stored in the first IC tag or the second IC tag is read by the reading means, it is possible to determine whether the play medium contained in the container is placed on the target surface so that either the first surface or the second surface of the container is in contact with the target surface. 【0516】 C7) An object (e.g., 80) according to another aspect of the present invention is an object (e.g., 80) that is contained in a container (e.g., 70, 70A, 70B) together with individual game media used in a game played using game media (e.g., 60) placed on a target surface (e.g., game field F), and includes an IC tag (e.g., 73, 73A-1, 73A-2, 73B-1, 73B-2) for retaining specific information for identifying the type or state of the game media placed on the target surface while contained in the container. 【0517】 According to the invention described in C7), an IC tag for holding specific information for identifying the type or state of the play medium placed on the target surface while contained in the container is provided on an object contained in the container together with the play medium.Therefore, by using the play medium while contained in the container and reading the specific information held in the IC tag with an IC tag reader, the type or state of the play medium placed on the target surface while contained in the container can be identified based on the read specific information. 【0518】 Furthermore, according to the invention described in C7), there is no need for the gaming medium itself to be equipped with a special mechanism to identify (or make it easier to identify) the type or state of the gaming medium placed on the target surface, and existing gaming media (gaming media that do not have the above-mentioned special mechanism) can also be used in the game. 【0519】 In this way, according to the invention described in C7), it is possible to identify (or make it easier to identify) the type or state of the play medium placed on the target surface in the real world, while making it possible to use existing play objects in games. 【0520】 D1) A container (e.g., 70C) according to another aspect of the present invention is a container (e.g., 70C) for storing individual game media used in a game played using game media (e.g., 60) placed on a target surface (e.g., game field F), and includes a first surface (e.g., 71C), a second surface (e.g., 72C) separate from the first surface, a first holding section (e.g., 77C-1) provided on the first surface for holding first identification information (e.g., a sleeve ID or a front / back flag) for identifying the type or state of the game media stored in the container, and a second surface (e.g., 77C-2) provided on the second surface for holding first identification information (e.g., a sleeve ID or a front / back flag) for identifying the type or state of the game media stored in the container. and a second holding section (e.g., 77C-2) for holding second identification information (e.g., a sleeve ID or a front / back flag) for identifying the state of the game medium, and when the game medium contained in the container is placed on the target surface so that the first surface section and the target surface are in contact, the second identification information held in the second holding section of the second surface section can be read by a reading means (130C), and when the game medium contained in the container is placed on the target surface so that the second surface section and the target surface are in contact, the first identification information held in the first holding section of the first surface section can be read by the reading means. 【0521】 According to the invention described in D1), when a play medium contained in a container is placed on a target surface so that the first surface is in contact with the target surface, the second identification information held in the second holding portion of the second surface is read by a reading means, and when a play medium contained in a container is placed on a target surface so that the second surface is in contact with the target surface, the first identification information held in the first holding portion of the first surface is read by a reading means.Therefore, in either case, the type of play medium placed on the target surface while contained in a container can be identified based on the information read by the reading means (the first identification information or the second identification information). 【0522】 Furthermore, according to the invention described in D1), when the second identification information held in the second holding portion of the second surface is read by the reading means, it can be identified that the play medium contained in the container is placed on the target surface with the first surface in contact with the target surface, and when the first identification information held in the first holding portion of the first surface is read by the reading means, it can be identified that the play medium contained in the container is placed on the target surface with the second surface in contact with the target surface, so it can be identified whether the play medium contained in the container is placed on the target surface with either the first surface or the second surface in contact with the target surface. In other words, the state of the play medium placed on the target surface while contained in the container can be identified. 【0523】 In this way, according to the invention described in D1), it is possible to make it possible to use existing play objects in games, while also making it possible (or easier to identify) the type or state of play media placed on a target surface in the real world. 【0524】 D2) In one aspect of the present invention, the first surface portion (e.g., 71C) may include a portion on which the first identification information is written in an invisible state that is not visible to humans as the first holding portion (e.g., 73C-1), and the second surface portion (e.g., 72C) may include a portion on which the second identification information is written in the invisible state as the second holding portion (e.g., 73C-2). 【0525】 According to the invention described in D2), the first and second identifying information are written in an invisible state that cannot be seen by humans, so it is possible to prevent the appearance of the game medium from being impaired. It is also possible to prevent humans from relying on the first or second identifying information to determine the type of game medium that they would not normally be able to determine (for example, the type of card placed face down while contained in a container). 【0526】 D3) In one aspect of the present invention, the second surface portion (e.g., 72C) may further include a third holding portion provided so as to have a predetermined positional relationship with the second holding portion (e.g., 73C-2). 【0527】 According to the invention described in D3), the second surface portion is further provided with a third holding portion arranged to have a predetermined positional relationship with the second holding portion, so that when the first surface portion is in contact with the target surface and the play medium contained in the container is placed on the target surface, the orientation of the play medium can be determined based on the positional relationship between the second holding portion and the third holding portion. 【0528】 D4) A container (e.g., 70C) according to another aspect of the present invention is a container for containing individual game media used in a game played using game media (e.g., 60) placed on a target surface (e.g., game field F), the game media including a surface (e.g., 61) having an appearance corresponding to the type of game media, the container having a first surface portion that faces the surface when the game media is contained in the container, and the front of the game media contained in the container can be seen from outside the container through the first surface portion. The device includes a first surface (e.g., 71C) configured to allow the recording surface to be viewed, a second surface (e.g., 72C) separate from the first surface, and a holding portion (e.g., 77C-2) provided on the second surface for holding specific information for identifying the type or state of the play medium contained in the container, and when the play medium contained in the container is placed on the target surface so that the first surface is in contact with the target surface, the specific information held in the holding portion of the second surface can be read by a reading means (130). 【0529】 According to the invention described in D4), even when the play medium contained in the container is placed on the target surface so that the first surface of the container is in contact with the target surface (i.e., when the play medium contained in the container is placed on the target surface without the surface having an appearance corresponding to the type of play medium being visible), the specific information held in the holding portion of the second surface can be read by a reading means, and based on the specific information, the type of play medium placed on the target surface while contained in the container can be identified. 【0530】 Furthermore, according to the invention described in D4), when the specific information held in the holder of the second surface is read by the reading means, it can be determined that the play medium contained in the container is placed on the target surface with the first surface in contact with the target surface, and therefore it can be determined whether the play medium contained in the container is placed on the target surface with the first surface in contact with the target surface. In other words, it is possible to determine the state of the play medium placed on the target surface while contained in the container. 【0531】 In this way, according to the invention described in D4), it is possible to identify (or make it easier to identify) the type or state of the play medium placed on the target surface in the real world, while making it possible to use existing play objects in games. [Explanation of symbols] 【0532】 1 System, 10, 10C Game board, 11 Housing, 12 Mat, 20-1 to 20-30 Reading device, 21 First antenna, 22 Second antenna, 30 Photography device, 30C-1 First photography device, 30C-2 Second photography device, 40 Information processing device, 50 Display terminal device, 41, 51 Control unit, 42, 52 Memory unit, 43, 53 Communication unit, 44, 54 Operation unit, 45, 55 display unit, 46, 56 audio output unit, 60, 60S, 60S-1, 60S-2, 60SA, 60SB, 60SC card, 61 front surface, 62 back surface, 600-1 to 600-4 card stack, 70, 70A, 70B, 70C sleeve, 71, 71A, 71B, 71C front surface, 72, 72A, 72B, 72C back surface, 73 IC tag, 73A-1, 73B-1 first IC tag, 73A-2, 73B-2 second IC tag, 74B blocking surface, 75B first surface, 76B second surface, 77C-1 first code, 77C-2 Second code, 80 Object, 100, 100A, 100B, 100C Object, 101 Holding unit, 101A, 101B, 101C First holding unit, 102A, 102B, 102C Second holding unit, 103B Restriction unit, 110 Photography unit, 110C First photography unit, 120 Photographed image acquisition unit, 120C First photographed image acquisition unit, 130, 130C Reading unit, 140 Read result acquisition unit, 150, 150A, 150B, 150C Identification unit, 151, 151A, 151B, 151C First identification unit, 152, 152A, 152B, 152C Second identification unit, 160 Display control unit, 170 Display unit, 180C Second photography unit, 190C Second captured image acquisition unit, A1 to A35 areas, D1, D1B, D1C associated data, D2, D2A, D2B first identification result data, D3, D3A, D3B, D3C second identification result data, D4 Game field status data, G game field images, I photographed images, P1~P4, PA-1~PA-4, PB-1, PB-2, PC parts, Z1~Z30 zones.

Claims

[Claim 1] A system for making a game played by a player by arranging multiple game media on a target surface visible to users other than the player, The game medium includes a surface on which information of the game medium is written and an IC tag on which the information is recorded. A photographing means for photographing the aforementioned target surface, A first image display means that displays the image captured by the aforementioned shooting means as a first image on a display device, A reading means for reading the information recorded on the IC tag, A second image display means that displays a second image containing the information read by the reading means, A switching means that switches between the first image and the second image in response to user instructions, A system that includes this. [Claim 2] The second image display means is characterized in that the captured image is included in the second image. The system according to claim 1. [Claim 3] The second image display means is characterized in that it displays the game medium displayed in the captured image and the information of the game medium read by the reading means in correspondence. The system according to claim 2.

Images