Portable communication terminal and control method thereof

Abstract

The portable communication terminal (A) performs near field communication with the other portable communication terminal (B) by means of the near field communication unit (101), and obtains a communication distance with the other portable communication terminal (B). The information acquisition unit (102) acquires the information of the other portable communication terminal (B), the information of the portable communication terminal (A), or both, when the communication distance with the other portable communication terminal (B) becomes equal to or greater than a threshold value. An abnormality determination unit (103) determines an abnormal state of the portable communication terminal (A) on the basis of the information (position information, wearing information, etc.) acquired by the information acquisition unit. A lock unit (104) locks the portable communication terminal (A) or the other portable communication terminal (B) or both when the abnormality determination unit determines that the state is abnormal. As a result, it is possible to accurately detect abnormal states such as loss and theft of the portable information terminal, and to avoid unnecessarily locking the terminal.

Description

[0001] This application is a divisional application of the invention patent application with the same name, filed on May 31, 2016, with application number 201680086302.2 Technical Field

[0002] The present invention relates to a technology for preventing a portable communication terminal from being lost or stolen. Background Art

[0003] As a technology for preventing the loss of a portable communication terminal, there is a technology disclosed in Patent Document 1, for example. The document describes "a portable communication terminal, comprising: a short-distance communication unit capable of short-distance communication with other portable communication terminals; a locking unit that, when judging that the distance to the other portable communication terminal is greater than a predetermined value based on the communication status between the short-distance communication unit and the other portable communication terminal, changes to a locked state for authentication of an operation request from the outside; a receiving unit that receives authentication information from the other portable communication terminal for releasing the locked state after confirming that the communication with the other portable communication terminal can be carried out; a lock release unit that releases the locked state based on the authentication information received by the receiving unit; and a condition setting unit that sets a permission condition for at least one of permitting the lock unit to change to the locked state and the lock release unit to release the locked state".

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2014-170429 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In recent years, the high performance and high functionality of portable communication terminals have been continuously developed and widely popularized. Examples of portable communication terminals include portable phones represented by smartphones, smart watches as watch-type portable communication terminals, head-mounted displays as glasses-type wearable devices, etc. On the other hand, in the event that a portable communication terminal is lost or stolen, the impact of the leakage of personal information is large, and an effective method to prevent loss and theft is needed. Patent document 1 discloses a technology in which multiple portable information terminals cooperate and use information about the distance between terminals to lock the portable information terminal to prevent loss and theft.

[0009] However, the method described in Patent Document 1 has the problem that the terminal is locked unnecessarily because the reason why the distance to other terminals exceeds the specified value is unknown, such as loss or theft, or temporary circumstances such as the user leaving the room. Furthermore, when it is impossible to communicate with other terminals at close range, it is impossible to obtain information about other terminals, making it difficult to accurately determine whether to lock the terminal.

[0010] The purpose of the present invention is to detect abnormal conditions such as loss and theft of a portable information terminal with high accuracy to avoid unnecessary locking of the terminal.

[0011] Technical solutions to solve problems

[0012] The above-mentioned problems are solved by, for example, the invention described in the claims.

[0013] Effects of the Invention

[0014] According to the present invention, it is possible to detect abnormal conditions such as loss or theft of a portable information terminal with high accuracy, thereby avoiding unnecessary locking of the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a block diagram showing the structure of the portable communication terminal of the first embodiment.

[0016] Figure 2 This is a schematic diagram showing short-range communication between portable communication terminal A and portable communication terminal B.

[0017] Figure 3 It is a diagram schematically illustrating the relationship between the communication distance and the communication strength.

[0018] Figure 4 This is a flowchart showing abnormality determination processing of a portable communication terminal.

[0019] Figure 5 Yes means Figure 4 Diagram of the criteria for judging the necessity of locking.

[0020] Figure 6 This is a flowchart showing abnormality determination processing of a portable communication terminal.

[0021] Figure 7 Yes means Figure 6 Diagram of the criteria for judging the necessity of locking.

[0022] Figure 8 This is a flowchart showing the abnormality determination process of the portable communication terminal according to the second embodiment.

[0023] Fig. 9 This is a flowchart showing the abnormality determination process of the portable communication terminal according to the third embodiment.

[0024] Fig.10 This is a flowchart showing the abnormality determination process of the portable communication terminal according to the fourth embodiment.

[0025] Fig.11 This is a block diagram showing the structure of a portable communication terminal according to a fifth embodiment.

[0026] Fig.12 This is a flowchart showing abnormality determination processing of a portable communication terminal. DETAILED DESCRIPTION

[0027] In the following, embodiments of the present invention are described using the drawings. In each embodiment, abnormality of a portable communication terminal is determined based not only on the communication distance with a cooperating portable communication terminal but also on a combination of location information and terminal information of each portable communication terminal.

[0028] (Example 1)

[0029] In the first embodiment, the abnormal state of each portable communication terminal is determined by using the location information of each portable communication terminal.

[0030] Figure 1 This is a block diagram showing the structure of the portable communication terminal of Example 1. This embodiment records an example of using two portable communication terminals in collaboration, in which the portable communication terminal serving as the operation source is portable communication terminal A (100A), and the portable communication terminal serving as the collaborating party is portable communication terminal B (100B). Moreover, the abnormal state (lost, stolen, etc.) of portable communication terminal A serving as the operation source is determined in collaboration with portable communication terminal B. As portable communication terminals, for example, smart phones, smart watches, etc. can be cited. As long as the portable terminals can communicate with each other, the devices are not limited, and can also be applied to wearable devices such as head-mounted displays and activity meters. In the following, the portable communication terminal A serving as the operation source is referred to as "terminal A", and the portable communication terminal B serving as the collaborating party is referred to as "terminal B". In order to collaborate, terminal A and terminal B perform initial settings such as authentication processing and pairing processing on each other.

[0031] Portable communication terminal A includes a short-range communication unit 101A, an information acquisition unit 102A, an abnormality judgment unit 103A, and a locking unit 104A. Usually, a portable communication terminal contains a large number of components in addition to these, but in this embodiment, only the components related to the abnormality judgment function are described. Portable communication terminal B also has the same structure as portable communication terminal A, and each component corresponding to terminal A is represented by 101B to 104B. As a result, portable communication terminal B also has the same abnormality judgment function as portable communication terminal A. However, when the abnormality judgment action and the locking action are not performed in portable communication terminal B, the abnormality judgment unit 103B and the locking unit 104B are not necessary.

[0032] The short-distance communication unit 101A performs short-distance communication 110 with the short-distance communication unit 101B of the terminal B, and requires a communication distance or communication strength to the terminal B. As a method of short-distance communication, for example, Bluetooth (registered trademark) and Wi-Fi (registered trademark) can be cited, but there is no particular limitation as long as it can communicate directly with the terminal B.

[0033] When the communication distance required by the short-distance communication unit 101A is greater than a threshold value or the communication strength is less than a threshold value, the information acquisition unit 102A acquires information required for abnormality determination from terminal A or terminal B or both. In this embodiment, the location information of both terminal A and terminal B is acquired.

[0034] Abnormality determination unit 103A determines whether terminal A is abnormal (lost or stolen) based on the information (location information of terminal A and terminal B) acquired by information acquisition unit 102A. If determined to be abnormal, it sends a command to lock terminal A to locking unit 104A.

[0035] The lock unit 104A locks the terminal A according to the lock command from the abnormality determination unit 103A. As a method of locking, there is a method of requesting authentication when starting the operation of the portable communication terminal, but this method is not particularly limited.

[0036] Figure 2 1 is a schematic diagram showing short-distance communication between a portable communication terminal A and a portable communication terminal B. In the figure, a terminal 100A such as a smartphone and a terminal 100B such as a smart watch perform short-distance communication 110 via, for example, Bluetooth (registered trademark). If the two terminals 100A and 100B are held by the same user, the communication distance X between the terminals is usually short. When the terminal 100A moves away from the user and is lost, the communication distance X between the terminals becomes larger.

[0037] Figure 3 Schematically illustrates the relationship between the communication distance and the communication strength. When there are no factors that hinder communication between the portable communication terminal A and the portable communication terminal B, the communication distance X and the communication strength A are simply inversely proportional. As long as this relationship is obtained in advance, the current communication distance X can be calculated based on the communication strength A of the short-range communication unit 101A.

[0038] In this embodiment, the abnormality judgment of the terminal is performed in two stages. In the first stage, it is judged whether the communication distance X between the terminals is more than the specified distance Xth (threshold). The threshold Xth should be set according to the usage of the terminal, and can be, for example, 10 to tens of meters when used at home or work. In addition, instead of the threshold Xth of the communication distance, it is also possible to judge whether the current communication strength A is reduced to or below the communication strength Ath (threshold) corresponding to Xth. However, relying solely on the judgment in the first stage, it is impossible to distinguish whether the reason why the communication distance X becomes more than the threshold Xth is due to the abnormal state of the terminal or a temporary situation such as the user's absence.

[0039] Therefore, as the second stage, the location information (movement status) of terminal A and terminal B is obtained for judgment. In order for terminal A to obtain location information from terminal B, the threshold value Xth of the communication distance is set to be less than the maximum communication distance Xmax of short-distance communication. This is because if the threshold value Xth is equal to Xmax, short-distance communication between terminals cannot be performed when the communication distance exceeds the threshold value Xth, and it becomes impossible to obtain the location information from terminal B. The following is an explanation of the abnormality judgment method of the terminal in the above-mentioned first and second stages.

[0040] Figure 4 This is a flowchart showing the abnormality determination process of the portable communication terminal. That is, terminal A cooperates with terminal B to determine whether the terminal (terminal A) is in an abnormal state.

[0041] In S300 , the short-distance communication unit 101A of the terminal A communicates with the terminal B to obtain the communication distance X between the two terminals.

[0042] In S301, the information acquisition unit 102A determines whether the communication distance X received from the short-distance communication unit 101A is greater than the threshold value Xth (first stage). If the communication distance X is greater than the threshold value Xth, the process proceeds to S302. If the communication distance X is less than the threshold value Xth, the determination process ends.

[0043] In S302, the information acquisition unit 102A acquires the location information of both terminal A and terminal B. Here, the method of acquiring the location information may be a method of tracking the location of the terminal such as GPS (Global Positioning System), or a method of using the acceleration sensor of the terminal to determine that the terminal is moving. The location information of terminal B is acquired by communicating with terminal B via the short-range communication unit 101A.

[0044] In S303, the abnormality determination unit 103A determines whether the positions of terminal A and terminal B are both moving based on the information obtained by the information acquisition unit 102A (Phase 2). If the positions of both terminals are moving, it is determined that an abnormal state such as loss or theft has occurred, and the process proceeds to S304. If the positions of both terminals are not moving, the determination process ends.

[0045] In S304, the abnormality determination unit 103A sends a command to the locking unit 104A, and the locking unit 104A locks the terminal A. For example, the terminal A is locked to authenticate the operation request from the outside. In addition, not only the terminal A but also the terminal B may be locked.

[0046] The above-described series of processes S300 to S304 are repeatedly executed periodically.

[0047] Figure 5 Yes means Figure 4 FIG. 1 is a diagram showing a judgment criterion for the necessity of locking in S303 of FIG. Here, the necessity of locking is judged based on the moving state of the two terminals, and when both terminals are in a moving state, it is judged that locking is necessary. The reason is described below.

[0048] When a user has multiple portable communication terminals, usually, all the terminals are worn by the user or placed around for use. Assuming that the user places terminal A in a certain place and wears terminal B to move to another place, sometimes the communication distance between terminal A and terminal B will also become above the threshold. In this case, terminal B is moving with the user, while terminal A is stationary. Therefore, under normal conditions, it is difficult for both terminals to be in a moving state.

[0049] On the other hand, when the user forgets to bring the terminal A with him / her, or when the terminal A is stolen, the terminal A is often in a moving state. Therefore, when the communication distance between the terminal A and the terminal B is greater than the threshold and both terminals are in a moving state, it is determined that the terminal is in an abnormal state such as lost or stolen. In this way, by combining the distance information and the moving state information of multiple terminals, it is possible to accurately determine and prevent the abnormal state of the portable communication terminal.

[0050] Furthermore, in the above-mentioned abnormality determination, by adding the location information of where the portable communication terminal is located, a more accurate determination can be made.

[0051] Figure 6 is a flowchart showing the abnormality determination process of the portable communication terminal. Figure 4 The process of adding or changing the flowchart.

[0052] In S311, based on the location information obtained in S302, it is determined whether the location of the terminal A or B is indoors. Whether it is indoors or outdoors can be determined based on, for example, GPS information. If the location of the terminal A or B is indoors, the process proceeds to S312, and if the location of the terminal A or B is outdoors, the process proceeds to S313.

[0053] In S312, Figure 4 Similarly, in S303, it is determined whether the positions of terminal A and terminal B are both moving. If both are moving, it is determined that an abnormal state has occurred, and the process proceeds to S304 to lock terminal A.

[0054] In S313, it is determined whether any of the positions of terminal A and terminal B is moving. If any of them is moving, it is determined that an abnormal state has occurred, and the process proceeds to S304 to lock terminal A.

[0055] Figure 7 Yes means Figure 6 The necessity of locking is determined by the judgment criteria of S311 to S313. The necessity of locking is changed according to whether the location of terminals A and B is indoors or outdoors. Since the risk of loss or theft is high when the terminal is located outdoors, it is determined to be necessary to lock as long as at least one of the terminals is moving. Figure 6 , Figure 7 This method can make more accurate abnormality judgments by changing the security intensity according to the location of the terminal.

[0056] In addition, as a method for unlocking the locked portable communication terminal A in this embodiment, the user can enter a password or fingerprint authentication on the authentication screen, but once the lock is unlocked, the loss and theft prevention function of this embodiment can be stopped before the close-range communication with the portable communication terminal B is performed again. Thus, in the case of simply forgetting to bring it, the user can unlock it to prevent unnecessary locking in the future. In addition, as another unlocking method, the locked terminal A can be unlocked when it moves and can communicate with the terminal B again in close range. Thus, even if the terminal A is accidentally locked, it can be automatically unlocked, which improves convenience.

[0057] In this embodiment, the portable communication terminal as the operation source is defined as terminal A, and the portable communication terminal of the cooperating party is defined as terminal B, and the abnormal state of terminal A is determined, but the relationship may be reversed. That is, the method of this embodiment may be applied to the determination of the abnormal state of terminal B of the cooperating party, and the method of this embodiment may also be applied to the determination of the abnormal state of both the operation source and the cooperating party terminals.

[0058] Relatedly, in Figure 4 or Figure 6 In S304 of the present invention, the locking instruction of terminal A can be sent to terminal B via the short-distance communication unit 101A, and terminal B can be locked by the locking unit 104B. Alternatively, both terminal A and terminal B can be locked by using the locking units 104A and 104B of the two terminals. Thus, no matter which of terminal A and terminal B is lost (or stolen), the portable communication terminal can be reliably locked to improve the security strength. This is also the same in the embodiments described later.

[0059] This embodiment describes the processing between two portable communication terminals, but the number of portable communication terminals may be more than 2. In this case, the operations described in this embodiment may be performed on all portable communication terminals in short-range communication.

[0060] According to the first embodiment, by using the position information and movement status information of a plurality of terminals, it is possible to detect and prevent abnormal states of portable communication terminals with high accuracy.

[0061] Other methods of determining the abnormal state of a portable communication terminal will be described below using several embodiments.

[0062] (Example 2)

[0063] In Example 2, the wearing information of whether the cooperating portable communication terminal B is being worn by the user is used to judge abnormality. In the case where a user holds multiple terminals A and B, when the communication distance between terminal A and terminal B is above the threshold and terminal B is worn by the user, it is obvious that terminal A has moved to a location far away from the user, and the possibility of terminal A being lost or stolen becomes high. Therefore, this situation is judged as an abnormal state.

[0064] Figure 8 1 is a flowchart showing the abnormality determination process of the portable communication terminal of the second embodiment. Figure 4 ) is that, in order to make an abnormality judgment, the wearing information of whether the cooperating portable communication terminal B is being worn by the user is used. Figure 4 Repeat instructions.

[0065] In S400 , the communication distance X between the terminals A and B is acquired. In S401 , it is determined whether the communication distance X is greater than or equal to a threshold value Xth. If the result of the determination is that the communication distance X is greater than or equal to the threshold value Xth, the process proceeds to S402 .

[0066] In S402, the information acquisition unit 102A acquires wearing information from the terminal B. As information for determining whether the terminal B is being worn, information on whether the terminal is being operated can be used. If it is a portable communication terminal of the type worn on the body, such as a watch, body information can also be acquired to determine whether it is being worn.

[0067] In S403, the abnormality determination unit 103A determines whether the terminal B is being worn based on the wearing information acquired by the information acquisition unit 102A. If the terminal B is being worn, it is determined that an abnormal state has occurred in the terminal A, and the process proceeds to S404. In S404, the abnormality determination unit 103A sends an instruction to the locking unit 104A, and the locking unit 104A locks the terminal A.

[0068] According to Embodiment 2, by using the wearing information of the cooperating portable communication terminal B, it is possible to detect the abnormal state of the terminal A with high accuracy. In addition, in the case where the terminal B is a device (wearable device) that is worn on the body, it is also possible to confirm whether the wearer is the same as the user based on the wearing information. Thus, it is also possible to determine whether the terminal B is stolen and worn by someone other than the user, and to perform more accurate anti-theft.

[0069] (Example 3)

[0070] In Embodiment 3, the charging information of whether the portable communication terminal A is in a charging state is used to determine the abnormal state of the terminal A. When a user has multiple terminals A and B, sometimes the terminal A is in a charging state and cannot be moved, and the distance from the terminal B becomes farther. In this case, the user intentionally leaves the terminal A and moves with the terminal B, and the possibility of loss or theft is low, and it is excluded from the abnormal judgment.

[0071] Fig. 9 1 is a flowchart showing the abnormality determination process of the portable communication terminal of the third embodiment. Figure 4 ) is that, in order to make an abnormality judgment, the charging information of whether the portable communication terminal A is in a charging state is used. Figure 4 Repeat instructions.

[0072] In S500 , the communication distance X between the terminals A and B is acquired. In S501 , it is determined whether the communication distance X is greater than or equal to a threshold value Xth. If the result of the determination is that the communication distance X is greater than or equal to the threshold value Xth, the process proceeds to S502 .

[0073] In S502 , the information acquisition unit 102A acquires the charging information of the terminal A. That is, it acquires whether the terminal A is connected to the charger or acquires information whether the terminal A is being charged from the power management unit.

[0074] In S503, the abnormality determination unit 103A determines whether the terminal A is being charged based on the charging information obtained by the information acquisition unit 102A. If it is in the charging state, it is determined that it is not in an abnormal state such as loss or theft, and the processing ends. If it is not in the charging state, proceed to S504. In S504, the abnormality determination unit 103A sends an instruction to the locking unit 104A, and the locking unit 104A locks the terminal A.

[0075] According to the third embodiment, the portable information terminal A is not locked while it is being charged, so that unnecessary locking operation can be avoided and usability can be improved.

[0076] (Example 4)

[0077] Example 4: An abnormality is determined using the remaining battery information stored in the portable communication terminal A. Usually, the portable communication terminal is charged by the user so that the remaining battery does not become 0, but the lost portable communication terminal cannot be charged and the remaining battery may become below a threshold, such as 0. In addition, when the remaining battery is insufficient, short-range communication is cut off, and distance information cannot be obtained. Therefore, this situation is determined to be an abnormal state.

[0078] Fig.10 4 is a flowchart showing the abnormality determination process of the portable communication terminal of the fourth embodiment. Figure 4 ) is that, in order to make an abnormality judgment, the battery remaining information stored in the portable communication terminal A is used. Figure 4 Repeat instructions.

[0079] In S600, the communication distance X between terminals A and B is acquired. In S601, it is determined whether the communication distance X is greater than or equal to a threshold value Xth. If the result of the determination is that the communication distance X is greater than or equal to the threshold value Xth, or if the communication distance X cannot be acquired through short-distance communication, the process proceeds to S602.

[0080] In S602, the information acquisition unit 102A acquires the remaining battery information from the terminal A. The remaining battery information can be acquired from the power management unit.

[0081] In S603, the abnormality determination unit 103A determines whether the battery remaining amount is below the threshold value based on the battery remaining amount information obtained by the information acquisition unit 102A. If it is below the threshold value, it is determined that an abnormal state such as loss or theft has occurred, and the process proceeds to S604. If the battery remaining amount is not below the threshold value, the process returns to S600 and the communication distance is determined again.

[0082] In S604 , the abnormality determination unit 103A sends an instruction to the locking unit 104A, and the locking unit 104A locks the terminal A.

[0083] According to the fourth embodiment, when the remaining battery level of the portable communication terminal A becomes equal to or less than the threshold value, the abnormal state can be detected with high accuracy.

[0084] (Example 5)

[0085] In Example 5, portable communication terminal A has a long-distance communication function, and switches between short-distance communication and long-distance communication according to the communication status with portable communication terminal B, accurately obtains the location information and terminal information of terminal B, and accurately determines the abnormal state of loss or theft. Here, short-distance communication means that terminals can communicate directly as described in Example 1, and long-distance communication means connecting to the Internet using 3G lines, LTE (Long Term Evolution), etc., and communicating with terminal B using the Internet. In Example 1, Wi-Fi is defined as short-distance communication, but Wi-Fi can also be treated as long-distance communication if it can be connected to the Internet.

[0086] Fig.11 2 is a block diagram showing the structure of the portable communication terminal of the fifth embodiment. The portable communication terminal A (200A) of the operation source is different from the portable communication terminal A (200A) of the first embodiment. Figure 1 ) is a portable communication terminal A (100A) with the addition of a long-distance communication unit 202, a communication mode switching unit 203, and switches 207 and 208. The other components 201, 204, 205, and 206 are similar to Figure 1 The components of 200A and 200B correspond to each other. In addition, the portable communication terminal B (200B) of the cooperation party also has the same structure as the portable communication terminal A (200A).

[0087] When the terminal A and the terminal B perform short-distance communication, the communication mode switching unit 203 connects the switches 207 and 208 to the short-distance communication unit 201 side. When the terminal A and the terminal B perform long-distance communication, the communication mode switching unit 203 connects the switches 207 and 208 to the long-distance communication unit 202 side. In the long-distance communication, the terminal A and the terminal B communicate via the Internet line 210.

[0088] Fig.12 This is a flowchart showing abnormality determination processing of a portable communication terminal.

[0089] In S700 , the communication mode switching unit 203 connects the switches 207 and 208 to the short-distance communication unit 201 side, and starts communicating with the terminal B using the short-distance communication unit 201 .

[0090] In S701, the communication mode switching unit 203 receives the communication distance information with the terminal B from the short-distance communication unit 201, and determines whether the short-distance communication can be performed. If the short-distance communication can be performed, the process proceeds to S702 to determine whether the communication distance X is greater than the threshold value Xth. If the result of the determination is that the communication distance X is greater than the threshold value Xth, the process proceeds to S705 to obtain information from the terminal B using the short-distance communication. Then, in S706, information is obtained from the terminal A. If the communication distance X is less than the threshold value Xth, the process ends.

[0091] If it is determined in S701 that short-distance communication is not possible, the process proceeds to S703.

[0092] In S703, the communication mode switching unit 203 connects the switches 207 and 208 to the long-distance communication unit 202 side and switches to the long-distance communication mode. As a result, the terminal A is connected to the Internet line 210 using the long-distance communication unit 202. In S704, the communication mode switching unit 203 determines whether long-distance communication can be performed. If long-distance communication can be performed, the process proceeds to S705, and information is obtained from the terminal B via the Internet line 210. Then, in S706, information is obtained from the terminal A. If long-distance communication cannot be performed in S704, the process proceeds to S706.

[0093] In S705, the information acquisition unit 204 acquires information from the terminal B using the short-distance communication unit 201 or the long-distance communication unit 202. The information acquired from the terminal B at this time includes the location information and the wearing information of the terminal B as described in the first and second embodiments.

[0094] In S706, the information acquisition unit 204 acquires the wearing information from the terminal A. The information acquired from the terminal A includes the location information of the terminal A, the charging information, the battery remaining amount information, etc., as described in the first, third, and fourth embodiments.

[0095] In S707, the abnormality determination unit 205 determines whether the terminal A is in an abnormal state based on the information of the terminal B and / or the terminal A acquired by the information acquisition unit 204. The determination criterion at this time is any one of the determination criteria of Embodiments 1 to 4. Alternatively, these determination criteria may be appropriately combined, and when any one of the determination criteria is abnormal, it is determined to be an abnormal state.

[0096] When the abnormality determination unit 205 determines that the terminal A is in an abnormal state, the process proceeds to S708, and sends an instruction to lock the terminal A to the locking unit 206, and the locking unit 206 locks the terminal A.

[0097] The above series of processes S700 to S708 are repeatedly executed at a predetermined time.

[0098] In the above-mentioned embodiments 1 to 4, when short-distance communication is not possible, the information of terminal B cannot be obtained, and only the information of terminal A itself has to be used to determine the abnormal state. In contrast, according to embodiment 5, even when short-distance communication is not possible, the communication method can be switched to long-distance communication to obtain the information of terminal B, and the abnormal state can be determined with higher accuracy. In addition, if the timing of switching from short-distance communication to long-distance communication is set not to the moment when short-distance communication is not possible, but the moment when the communication distance of short-distance communication becomes above the threshold, it is possible to switch from short-distance communication to long-distance communication without cutting off the communication, thereby further improving the reliability.

[0099] In addition, the present embodiment describes a method for switching short-distance communication and long-distance communication, but both short-distance communication and long-distance communication can be used simultaneously. This can save the trouble of switching communication modes, and can continuously use a communication mode with higher communication strength, thereby improving the accuracy of abnormal judgment.

[0100] In addition, the present invention is not limited to the above-mentioned embodiments, but also includes various modified examples. For example, the above-mentioned embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not limited to all structures that must be described. In addition, a part of the structure of one embodiment can be replaced with a structure of another embodiment, and another structure can be added to the structure of one embodiment. In addition, other structures can be added, deleted, or replaced with a part of the structure of each embodiment.

[0101] In addition, part or all of the above-mentioned structures, functions, processing parts, processing units, etc. can be implemented in hardware, for example, through integrated circuit design. In addition, the above-mentioned structures, functions, etc. can also be implemented in software by interpreting and executing programs that implement each function through a processor. Information such as programs, tables, files, etc. that implement each function can be stored in a recording device such as a memory, a hard disk, an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

[0102] In addition, the control lines and information lines are those required for explanation, and do not necessarily represent all the control lines and information lines required on the product. In fact, it can be assumed that all structures are connected to each other.

[0103] Description of Reference Numerals

[0104] 100A…portable communication terminal A, 100B…portable communication terminal B, 101…short distance communication unit, 102…information acquisition unit, 103…abnormality judgment unit, 104…locking unit, 200A…portable communication terminal A, 200B…portable communication terminal B, 201…short distance communication unit, 202…long distance communication unit, 203…communication mode switching unit, 204…information acquisition unit, 205…abnormality judgment unit, 206…locking unit, 207, 208…switches, 210…Internet line.

Claims

1. A first portable communication terminal capable of communicating with a second portable communication terminal, characterized in that: include: a short distance communication unit, which performs short distance communication with the second portable communication terminal; A long-distance wireless communication unit for wireless communication with the Internet; GPS signal receiver; Accelerometer; and processor, where The processor unlocks the portable communication terminal when the input password or fingerprint passes the authentication, determining whether an abnormal state has occurred based on at least one of first information about the first portable communication terminal and second information about the second portable communication terminal acquired through the short-distance communication unit, When it is determined that the abnormal state has occurred, at least one of the first portable communication terminal and the second portable communication terminal is locked, wherein: In the first abnormality determination mode, based on a first abnormality determined based on at least one of the first information and the second information, it is determined that an abnormal state has occurred. In the second abnormality determination mode, it is configured to determine that an abnormal state has occurred based on a second abnormal state that is determined based on at least one of the first information and the second information and is different from the first abnormal state. Switching between the first abnormality determination mode and the second abnormality determination mode is controlled based on a predetermined condition.

2. The first portable communication terminal according to claim 1, characterized in that: The processor is configured to detect whether the first portable communication terminal is located at a specific location using current location information detected at least based on a GPS signal received by the GPS signal receiver, The predetermined condition is whether the first portable communication terminal is located at the specific location.

3. The first portable communication terminal according to claim 2, characterized in that: The first information is movement information of the first portable communication terminal acquired by the acceleration sensor, The second information is movement information of the second portable communication terminal, The specific place is either indoors or outdoors.

4. The first portable communication terminal according to claim 1, characterized in that: The processor is configured to determine whether the distance to the second portable communication terminal is greater than or equal to a threshold.

5. The first portable communication terminal according to claim 1, characterized in that: The first abnormal state is that both the first portable communication terminal and the second portable communication terminal are moving, The second abnormal state is that either the first portable communication terminal or the second portable communication terminal is moving.

6. The first portable communication terminal according to claim 1, characterized in that: The processor is configured to acquire, from the second portable communication terminal through the short-distance communication unit, wearing information indicating whether the second portable communication terminal is being worn by a user, The predetermined condition is whether the second portable communication terminal is being worn by the user, as indicated by the wearing information.

7. The first portable communication terminal according to claim 1, characterized in that: The processor is configured to obtain charging information indicating whether the first portable communication terminal is being charged from a battery control circuit of the portable communication terminal, The predetermined condition is whether the second portable communication terminal is being charged, as indicated by the charging information.

8. The first portable communication terminal according to claim 1, characterized in that: The long-distance wireless communication unit is configured to perform wireless communication with the second portable communication terminal via the Internet. The processor is configured to switch from the short-distance communication unit to the long-distance wireless communication unit when communication with the second portable communication terminal via the short-distance communication unit is impossible.

9. The first portable communication terminal according to claim 1, characterized in that: The long-distance wireless communication unit is configured to perform wireless communication based on the LTE mobile communication standard or the Wi-Fi communication standard.

10. The first portable communication terminal according to claim 1, characterized in that: The short-distance communication unit is configured to perform short-distance wireless communication based on the Bluetooth standard.

11. A control method for controlling a first portable communication terminal to communicate with a second portable communication terminal, characterized in that: The first portable communication terminal comprises: a short distance communication unit, which performs short distance communication with the second portable communication terminal; A long-distance wireless communication unit for wireless communication with the Internet; GPS signal receiver; and Accelerometer, The control method comprises: When the input password or fingerprint is authenticated, the portable communication terminal is unlocked. determining whether an abnormal state has occurred based on at least one of first information about the first portable communication terminal and second information about the second portable communication terminal acquired through the short-distance communication unit, When it is determined that the abnormal state has occurred, at least one of the first portable communication terminal and the second portable communication terminal is locked, wherein: In the first abnormality determination mode, based on a first abnormality determined based on at least one of the first information and the second information, it is determined that an abnormality has occurred. In the second abnormality determination mode, based on a second abnormality state determined based on at least one of the first information and the second information and different from the first abnormality state, it is determined that an abnormal state has occurred, Switching between the first abnormality determination mode and the second abnormality determination mode is controlled based on a predetermined condition.

12. The control method according to claim 11, characterized in that: Also includes: using current location information detected at least based on the GPS signal received by the GPS signal receiver to detect whether the first portable communication terminal is located at a specific location, The specified condition is whether the first portable communication terminal is located at the specific location.

13. The control method according to claim 12, characterized in that: The first information is movement information of the first portable communication terminal acquired by the acceleration sensor, The second information is movement information of the second portable communication terminal, The specific place is either indoors or outdoors.

14. The control method according to claim 11, characterized in that: Also includes: It is determined whether the distance to the second portable communication terminal is greater than a threshold.

15. The control method according to claim 11, characterized in that: The first abnormal state is that both the first portable communication terminal and the second portable communication terminal are moving, The second abnormal state is that either the first portable communication terminal or the second portable communication terminal is moving.

16. The control method according to claim 11, characterized in that: Also includes: acquiring, from the second portable communication terminal, through the short-distance communication unit, wearing information indicating whether the second portable communication terminal is being worn by a user, The predetermined condition is whether the second portable communication terminal is being worn by the user, as indicated by the wearing information.

17. The control method according to claim 11, characterized in that: Also includes: acquiring charging information indicating whether the first portable communication terminal is being charged from a battery control circuit of the first portable communication terminal, The predetermined condition is whether the second portable communication terminal is being charged, as indicated by the charging information.

18. The control method according to claim 11, characterized in that: Also includes: using the long-distance wireless communication unit to perform wireless communication with the second portable communication terminal via the Internet, When communication with the second portable communication terminal via the short-distance communication unit is not possible, the short-distance communication unit is switched to the long-distance wireless communication unit.

19. The control method according to claim 11, characterized in that: Also includes: The long-distance wireless communication unit is used to perform wireless communication based on the LTE mobile communication standard or the Wi-Fi communication standard.

20. The control method according to claim 11, characterized in that: Also includes: The short-distance communication unit performs short-distance wireless communication based on the Bluetooth standard.

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