Display device, display method and program

Abstract

To easily recognize an electronic book with a high browsing frequency.SOLUTION: A CPU 11 of a PC 10 displays an external appearance image G22 expressing an external appearance about each of a plurality of books, on a predetermined display region (a first step shelf G21a of a second list screen G2) in a display unit 15 side by side. Moreover, the CPU 11 determines whether to display the external appearance image G22 about each of the plurality of books displayed on the predetermined display region (the first step shelf G21a of the second list screen G2), as a front cover image expressing a front cover, or display it as a back cover image expressing a back cover, on the basis of the browsing frequency about each of the plurality of books displayed on the predetermined display region (the first step shelf G21a of the second list screen G2).SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a display device, a display method, and a program.

Background Art

[0002] Conventionally, an e-book distribution system that distributes e-books from a distribution server to a client device via a network such as the Internet is known. For example, in the e-book distribution system disclosed in Patent Document 1, there is a mechanism for selecting and purchasing a desired e-book from an e-book list displayed on a client device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the e-book distribution system disclosed in Patent Document 1 above, the name of the e-book and the thumbnail image of the cover of the e-book are simply arranged and displayed in the e-book list, and no display is performed to make it easy to distinguish e-books with high browsing frequencies.

[0005] The present invention has been made in view of such problems, and an object thereof is to make it easy to distinguish e-books with high browsing frequencies.

Means for Solving the Problems

[0006] In order to solve the above problems, a display device according to the present invention includes display control means for arranging and displaying appearance images representing the appearances of a plurality of books in a predetermined display area on a display unit. The display control means determines whether to display the appearance image of each of the plurality of books to be displayed in the predetermined display area as a front cover image representing the front cover or as a back cover image representing the back cover based on the browsing frequency of each of the plurality of books to be displayed in the predetermined display area.

Advantages of the Invention

[0007] According to the present invention, it is possible to easily distinguish electronic books with high browsing frequencies.

Brief Description of the Drawings

[0008]

Figure 1

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Embodiments for Carrying Out the Invention

[0009] Hereinafter, with reference to the drawings, an example of an embodiment when a display device according to the present invention is applied to a PC (Personal Computer) will be described.

[0010] <Configuration of the PC> First, referring to FIG. 1, the functional configuration of the PC 10 will be described. Assume that the PC 10 is a desktop PC used by the user, but it may also be a notebook PC, a tablet PC, etc. As shown in FIG. 1, the PC 10 includes a CPU 11, a RAM 12, a storage unit 13, an operation unit 14, a display unit 15, a communication unit 16, a bus 17, etc. Each part of the PC 10 is connected via the bus 17.

[0011] The CPU 11 is a processor that reads and executes the program 131 stored in the storage unit 13 and controls the operations of each part of the PC 10 by performing various arithmetic processes. The RAM 12 provides a working memory space for the CPU 11 and stores temporary data. The storage unit 13 is a non-temporary recording medium readable by the CPU 11 as a computer, and stores the program 131 and various data (for example, the content database 132, the browsing history table 133, etc.).

[0012] Program 131 is stored in storage unit 13 in a form of computer-readable program code. Content database (predetermined database) 132 is a database in which content data regarding electronic books (hereinafter referred to as books) is stored. In this content database 132, for each book, information such as, for example, book name, book ID for identifying the book, text data of the book, and appearance image (e.g., photo image) expressing the appearance of the book is stored in an associated manner. The appearance image includes a front cover image expressing the front cover of the book and a back cover image expressing the back cover of the book. Note that the sizes (dimensions) of the front cover image and the back cover image are assumed to be a predetermined size common to each book. The browsing history table 133 is a table for recording the browsing history of the books stored in the content database 132. In the browsing history table 133, for each book, information such as, for example, book name, book ID, browsing date and time, etc. is recorded in an associated manner. The browsing date and time means the date and time when the text of the book is displayed on the display unit 15 by designating the appearance image G11 (described later; see FIG. 3) or the appearance image G22 (described later; see FIG. 4) corresponding to the relevant book.

[0013] The operation unit 14 has a key input unit such as a keyboard and a pointing device such as a mouse, accepts key operation input and position operation input from the user, and outputs the operation information to the CPU 11. The CPU 11 accepts the input operation of the user based on the information transmitted from the operation unit 14. The display unit 15 is composed of an LCD (Liquid Crystal Display), an EL (Electro Luminescence) display, etc., and performs various displays according to the display information instructed by the CPU 11. The communication unit 16 performs a communication operation according to a predetermined communication standard. The communication unit 16 performs transmission and reception of information with an external device via a communication network by this communication operation.

[0014] <Operation of the PC> [Content List Display Process] Next, with reference to FIG. 2, the operation of the PC 10 when executing the content list display process will be described. The content list display process is a process for causing the display unit 15 to display a list of books (contents) stored in the content database 132. The content list display process is started when a request for displaying a list of contents is made by the user via the operation unit 14.

[0015] As shown in FIG. 2, first, the CPU 11 of the PC 10 causes the display unit 15 to display a first list screen G1 (step S1). As shown in FIG. 3, in the first list screen G1, appearance images G11 representing the appearances of books (“English-Japanese Dictionary”, “English Navigation”, “Inspiring English Words”, etc.) stored in the content database 132 are displayed side by side vertically and horizontally. In the first list screen G1, the appearance image G11 corresponding to each book is displayed as a front cover image representing the front cover of the book. In the first list screen G1, the display positions of the appearance images G11 corresponding to the respective books are set in advance, and the user cannot change the display positions of the appearance images G11. In the first list screen G1, when an appearance image G11 corresponding to a certain book (for example, “Important Archaic Words Dictionary”) is designated via the operation unit 14, the text of the book corresponding to this appearance image G11 is displayed on the display unit 15, and the browsing history of the book is recorded in the browsing history table 133. Also, a display switching button G12 is provided on the first list screen G1. When the user presses the display switching button G12 in the first list screen G1, a second list screen G2 described later is displayed on the display unit 15.

[0016] Returning to FIG. 2, next, the CPU 11 determines whether or not an operation of pressing the display switching button G12 has been performed on the first list screen G1 (step S2). If it is determined in step S2 that the operation of pressing the display switching button G12 has not been performed (step S2; NO), the CPU 11 determines whether or not an operation (end operation) for closing the first list screen G1 has been performed (step S3). If it is determined in step S3 that the operation (end operation) for closing the first list screen G1 has not been performed (step S3; NO), the CPU 11 returns the process to step S2 and repeats the subsequent processes. Also, if it is determined in step S3 that the operation (end operation) for closing the first list screen G1 has been performed (step S3; YES), the CPU 11 ends the content list display process.

[0017] Also, if it is determined in step S2 that the operation of pressing the display switching button G12 has been performed (step S2; YES), the CPU 11 causes the display unit 15 to display the second list screen G2 (step S4). As shown in FIG. 4, on the second list screen G2, a bookshelf image G21 representing a bookshelf having a plurality of shelves G21a, G21b,... is displayed, and on each of the shelves G21a, G21b,... of this bookshelf image G21, appearance images G22 representing the appearances of the respective books ("English-Japanese Dictionary", "English Navigation", "Inspiring English Words", etc.) stored in the content database 132 are arranged and displayed.

[0018] Specifically, on the first row (top row) of the bookshelf image G21, i.e., on the shelf G21a (predetermined display area), the appearance images G22 corresponding to the 12 most frequently used books, i.e., the 12 books with high browsing frequencies, are arranged and displayed in descending order of browsing frequency from the left end. Among these appearance images G22, the appearance images G22 corresponding to the top 5 books (TOP5) with high browsing frequencies (the "English-Japanese Dictionary", "English Navigation", "Inspiring English Words", "Japanese Dictionary", "Important Archaic Words Dictionary") are each displayed as front cover images representing the front covers of the corresponding books. On the other hand, the appearance images G22 corresponding to the lower 7 books (the "Comprehensive English", "Word Collection", "Glossary of Japanese History Terms", "High School Math Formula Collection", "Chemical Dictionary", "Chemical Reaction Formula Handbook", "Biological Dictionary") other than the top 5 books (TOP5) are each displayed as back cover images representing the back covers of the corresponding books. Here, the browsing frequency means the number of times the appearance image G22 (or appearance image G11; see FIG. 3) corresponding to the relevant book is specified and the text of the book is displayed on the display unit 15 within the most recent 30 days based on the day when the second list screen G2 is displayed on the display unit 15. This browsing frequency can be derived by using information such as browsing dates and times recorded in the browsing history table 133.

[0019] In addition, on the second and subsequent shelves G21b, … (other shelves) of the bookshelf image G21, the appearance images G22 corresponding to the respective books stored in the content database 132 are each displayed in a manner that can be arranged at the positions desired by the user. That is, on the second and subsequent shelves G21b, …, the appearance images G22 corresponding to all the books including the 12 books with high browsing frequencies displayed on the first shelf G21a described above are displayed. For example, the appearance image G22 corresponding to the book “Kime-tan 0” displayed at the left end of the second shelf G21b can be moved to the right end of the shelf G21b (to the right of the appearance image G22 corresponding to the book “Elementary Vocabulary Collection”) or to the third and subsequent shelves (not shown). Also, by executing the display mode change process (see FIG. 7) described later, the appearance images G22 displayed on the second and subsequent shelves G21b, … of the bookshelf image G21 can be switched from the state where the front cover image is displayed to the state where the back cover image is displayed, or from the state where the back cover image is displayed to the state where the front cover image is displayed.

[0020] In addition, a display switch button G23 is provided on the second list screen G2. When the user presses the display switch button G23 on the second list screen G2, the above-described first list screen G1 is displayed on the display unit 15. Also, a scroll bar G24 is provided on the second list screen G2. When the user operates the scroll bar G24 (a slide operation downward) on the second list screen G2, the second list screen G2 slides upward and the third and subsequent shelves are displayed on the display unit 15.

[0021] Returning to FIG. 2, next, the CPU 11 determines whether or not an operation of pressing the display switching button G23 has been performed on the second list screen G2 (step S5). If it is determined in step S5 that an operation of pressing the display switching button G23 has been performed (step S5; YES), the CPU 11 returns the process to step S1 and repeats the subsequent processes. Also, if it is determined in step S5 that an operation of pressing the display switching button G23 has not been performed (step S5; NO), the CPU 11 determines whether or not an operation (end operation) for closing the second list screen G2 has been performed (step S6). If it is determined in step S6 that an operation (end operation) for closing the second list screen G2 has not been performed (step S6; NO), the CPU 11 returns the process to step S5 and repeats the subsequent processes. Also, if it is determined in step S5 that an operation (end operation) for closing the second list screen G2 has been performed (step S5; YES), the CPU 11 ends the content list display process.

[0022] [Popup display process] Next, referring to FIG. 5, the operation of the PC 10 when executing the popup display process will be described. The popup display process is a process of displaying the front cover image of the book corresponding to the appearance image G22 at a position adjacent to the appearance image G22 when a mouse-over operation is performed on the appearance image G22 displayed as a back cover image on the second list screen G2 (see FIG. 4). Therefore, the popup display process is a process that is executed when the second list screen G2 is displayed on the display unit 15. Also, in the popup display process, the appearance images G22 displayed as back cover images on each of the first-stage shelf G21a and the second-stage and subsequent shelves G21b,... of the bookshelf image G21 are the targets of popup display.

[0023] As shown in FIG. 5, first, the CPU 11 of the PC 10 determines whether or not a mouse-over operation has been performed on the appearance image G22 displayed as the back cover image in the second list screen G2 (step S11). The mouse-over operation refers to an operation of overlapping the pointer G25 on the appearance image G22 displayed as the back cover image, as shown in FIG. 6. Note that FIG. 6 is a diagram obtained by extracting the right-side portion of the second list screen G2 shown in FIG. 4. In step S11, if it is determined that no mouse-over operation has been performed on the appearance image G22 displayed as the back cover image (step S11; NO), the CPU 11 repeatedly performs the determination process of step S11 until the mouse-over operation is performed. Then, in step S11, if it is determined that a mouse-over operation has been performed on the appearance image G22 (for example, the appearance image G22 corresponding to the book "High School Math Formula Collection"; see FIG. 6) displayed as the back cover image (step S11; YES), the CPU 11, as shown in FIG. 6, pop-up displays the front cover image G26 of the book "High School Math Formula Collection" corresponding to the appearance image G22 at a position adjacent to the appearance image G22 (for example, a predetermined position to the right of the appearance image G22) (step S12). Then, the CPU 11 ends the pop-up display process. Here, the pop-up display is performed while the above-described mouse-over operation is being performed, and ends when the mouse-over operation is canceled.

[0024] [Display Mode Change Process] Next, with reference to FIG. 7, the operation of the PC 10 when executing the display mode change process will be described. The display mode change process is a process of changing the display mode of the appearance images G22 displayed on the second and subsequent shelves G21b,... of the second list screen G2 (see FIG. 4). That is, the appearance images G22 displayed on the first shelf G21a of the second list screen G2 are not subject to the display mode change process.

[0025] As shown in FIG. 7, first, the CPU 11 of the PC 10 determines whether a predetermined display mode change operation has been performed on the appearance image G22 displayed as the back cover image in the second and subsequent shelves G21b,... of the second list screen G2 (step S21). Here, the display mode change operation refers to, for example, an operation of right-clicking the mouse as the operation unit 14 in a state where the above-described mouse-over operation has been performed. In step S21, if it is determined that no predetermined display mode change operation has been performed on the appearance image G22 displayed as the back cover image (step S21; NO), the CPU 11 advances the process to step S23. Further, in step S21, if it is determined that a predetermined display mode change operation has been performed on the appearance image G22 (for example, the appearance image G22 corresponding to the book "German Spoken Language"; see FIG. 8(a)) displayed as the back cover image (step S21; YES), the CPU 11 causes the appearance image G22 to be displayed as the front cover image as shown in FIG. 8(b) (step S22). Note that FIGS. 8(a) and 8(b) are images obtained by extracting the periphery including the appearance image G22 corresponding to the book "German Spoken Language" from the second list screen G2 shown in FIG. 4.

[0026] Next, the CPU 11 determines whether a predetermined display mode change operation has been performed on the front cover image of the appearance image G22 displayed on the second and subsequent shelves G21b, … of the second list screen G2 (step S23). If it is determined in step S23 that no predetermined display mode change operation has been performed on the appearance image G22 displayed on the front cover image (step S23; NO), the CPU 11 ends the display mode change process. Also, if it is determined in step S23 that a predetermined display mode change operation has been performed on the appearance image G22 (for example, the appearance image G22 corresponding to the book "Kimetan 1"; see FIG. 9(a)) displayed on the front cover image (step S23; YES), the CPU 11 causes the appearance image G22 to be displayed as a back cover image as shown in FIG. 9(b) (step S24). Then, the CPU 11 ends the display mode change process. Note that FIGS. 9(a) and 9(b) are images obtained by extracting the periphery including the appearance image G22 corresponding to the book "Kimetan 1" from the second list screen G2 shown in FIG. 4.

[0027] As described above, the CPU 11 of the PC 10 arranges and displays the appearance images G22 representing the appearances of a plurality of books in a predetermined display area (the shelf G21a in the first row of the second list screen G2) on the display unit 15. Further, the CPU 11 determines whether to display the appearance images G22 of each of the plurality of books to be displayed in the predetermined display area (the shelf G21a in the first row of the second list screen G2) as a front cover image representing the front cover or as a back cover image representing the back cover, based on the browsing frequency of each of the plurality of books to be displayed in the predetermined display area (the shelf G21a in the first row of the second list screen G2). Therefore, according to the PC 10, the browsing frequency of the book corresponding to the appearance image G22 can be grasped by the display mode (front cover image or back cover image) of the appearance image G22 of each of the plurality of books displayed in the predetermined display area (the shelf G21a in the first row of the second list screen G2), so that it is easy to distinguish books with a high browsing frequency.

[0028] Further, the CPU 11 displays the front cover image as the appearance image G22 of the books with the highest browsing frequencies among the plurality of books to be displayed in a predetermined display area (the first - tier shelf G21a of the second list screen G2), and displays the back cover image as the appearance image G22 of the books with the lowest browsing frequencies. Therefore, according to the PC 10, since the appearance image G22 of the books with the highest browsing frequencies is displayed as the front cover image and the appearance image G22 of the books with the lowest browsing frequencies is displayed as the back cover image, it is possible to distinguish at a glance between the books with the highest browsing frequencies and the books with the lowest browsing frequencies.

[0029] Also, the CPU 11 displays the appearance image G22 for the books with the highest browsing frequencies among the plurality of books stored in a predetermined database (content database 132) in a predetermined display area (the first - tier shelf G21a of the second list screen G2). Therefore, according to the PC 10, access to the books with the highest browsing frequencies among the plurality of books stored in the predetermined database (content database 132) becomes easier.

[0030] In addition, the CPU 11 causes the display unit 15 to display a bookshelf image G21 representing a bookshelf having a plurality of tiers of shelves G21a, G21b,... and sets a predetermined shelf (the first - tier shelf G21a) among the plurality of tiers of shelves G21a, G21b,... as a predetermined display area. Therefore, according to the PC 10, since the predetermined shelf (the first - tier shelf G21a) is set as the above - mentioned predetermined display area, it is possible to distinguish at a glance between the books with the highest browsing frequencies and the books with the lowest browsing frequencies from the predetermined shelf (the first - tier shelf G21a).

[0031] Further, the CPU 11 sets other shelves (the second and subsequent shelves G21b, …) among the plurality of shelves G21a, G21b, … as a display area for displaying the appearance images G22 for a plurality of books stored in a predetermined database (content database 132). Therefore, according to the PC 10, in other shelves (the second and subsequent shelves G21b, …) among the plurality of shelves G21a, G21b, …, the books can be handled as if they were placed on a bookshelf, so that the stress caused by a usage feeling different from that of a book issued in a paper medium can be reduced.

[0032] Also, when the appearance image G22 displayed as a back cover image is designated, the CPU 11 displays the front cover image of the book corresponding to the designated appearance image G22 at a position adjacent to the designated appearance image. Therefore, according to the PC 10, the front cover of the book corresponding to the appearance image G22 displayed as a back cover image can be confirmed smoothly and simply.

[0033] Further, the CPU 11 displays the appearance images G22 for each of the plurality of books to be displayed in a predetermined display area (the first-stage shelf G21a of the second list screen G2) in the order of decreasing browsing frequency. Therefore, according to the PC 10, the browsing frequency of the book corresponding to the appearance image G22 can be grasped by the order of arrangement of the appearance images G22 in a predetermined display area (the first-stage shelf G21a of the second list screen G2), so that it is easy to distinguish books with a high browsing frequency.

[0034] As described above, the present invention has been specifically described based on the embodiments. However, the present invention is not limited to the above embodiments and can be modified without departing from the gist thereof. For example, in the above embodiment, the appearance image G11 (see FIG. 3) and the appearance image G22 (see FIG. 4) have been described as photographic images. However, any image that represents the appearance of a book may be used, for example, an illustration image.

[0035] Also, in the above embodiment, in the display mode change process (see FIG. 7), the appearance image G22 displayed as the back cover image can be changed to the front cover image for display, or the appearance image G22 displayed as the front cover image can be changed to the back cover image for display. For example, the appearance image G22 displayed as the back cover image can be changed to the inside back cover image for display, or the appearance image G22 displayed as the front cover image can be changed to the inside back cover image for display. In such a case, it is assumed that the inside back cover images (appearance images) corresponding to each book are stored in the content database 132.

[0036] Also, in the above embodiment, it has been described that the sizes when the appearance image G22 is displayed as the front cover image and when it is displayed as the back cover image on the second list screen G2 are predetermined common sizes for each book. However, regarding the size of the front cover image, it may be set to a size corresponding to the actual size of the book (such as B5 size, A5 size, pocket size, etc.), and regarding the size of the back cover image, it may be set to a size corresponding to the actual number of pages of the book. In such a case, for example, in the first row of the bookshelf image G21, there may be a case where all of the appearance images G22 corresponding to 12 books with high browsing frequencies do not fit within the second list screen G2. Also, for example, in the second row of the bookshelf G21b, when the number of appearance images G22 displayed as the front cover image is large, there may be a case where all of the appearance images G22 displayed on the second row of the bookshelf G21b do not fit within the second list screen G2. In such a case, in the above cases, the first row of the bookshelf G21a and the second row of the bookshelf G21b may be displayed in a slidable manner in the horizontal direction.

[0037] Also, in the above-described embodiment, when the content list display process (see FIG. 2) is executed, on the second list screen G2 (see FIG. 4), appearance images G22 corresponding to 12 books with high browsing frequencies are each displayed on the first shelf G21a of the bookshelf image G21. However, for example, for each user using the PC 10, the appearance images G22 corresponding to 12 books with high browsing frequencies corresponding to the user may be each displayed on the shelf G21a. In such a case, the user may be managed based on the login information (such as the user ID) when the user logs in to the PC 10 (or when logging in to a predetermined application). In the browsing history table 133, for each book, in addition to information such as the book name, book ID, and browsing date and time, a user ID (the user ID of the user who browsed the corresponding book) for identifying each user is further associated and recorded.

[0038] Also, in the above-described embodiment, when the content list display process (see FIG. 2) is executed, on the first list screen G1 (see FIG. 3), the appearance images G11 corresponding to the books stored in the content database 132 are displayed in a vertically and horizontally arranged state. However, for example, among the books stored in the content database 132, for the books licensed to the logged-in user, the appearance images G11 corresponding to the books may be displayed in a vertically and horizontally arranged state. Similarly, also in the second and subsequent shelves G21b,... of the second list screen G2, for the books stored in the content database 132 that are licensed to the logged-in user, the appearance images G22 corresponding to the books may be displayed in an arranged state. In such a case, for example, in the user database (not shown) stored in the storage unit 13, it is assumed that information regarding the books licensed to each user is stored for each user.

[0039] In addition, in the above-described embodiment, the case where the display device according to the present invention is applied to a PC has been described as an example. However, the present invention is not limited to a PC, and for example, it can also be applied to a terminal device having a display unit such as an electronic dictionary, a smartphone, or a game device.

[0040] Further, in the above-described embodiment, an example in which the non-temporary recording medium of the storage unit 13 is used as the computer-readable medium of the program according to the present invention has been disclosed. However, the present invention is not limited to this example. As other computer-readable media, it is possible to apply a flash memory or a portable recording medium such as a CD-ROM. In addition, a carrier wave is also applied to the present invention as a medium for providing the data of the program according to the present invention via a communication line.

Explanation of Reference Numerals

[0041] 10 PC, 11 CPU, 12 RAM, 13 Storage unit, 131 Program, 132 Content database, 133 Browsing history table, 14 Operation unit, 15 Display unit, 16 Communication unit

Claims

1. It includes display control means for arranging and displaying appearance images representing the appearance of each of a plurality of books in a predetermined display area on a display unit. The display control means determines whether to display the appearance image of each of the plurality of books to be displayed in the predetermined display area as a front cover image representing the front cover or as a back cover image representing the back cover, based on the browsing frequency of each of the plurality of books to be displayed in the predetermined display area. A display device characterized by the above.

2. The display control means displays the appearance image of the book with the highest browsing frequency among the plurality of books to be displayed in the predetermined display area as the front cover image, and displays the appearance image of the book with the lowest browsing frequency as the back cover image. The display device according to claim 1, characterized by the above.

3. The display control means displays the appearance image in the predetermined display area for the book with the highest browsing frequency among the plurality of books stored in a predetermined database. The display device according to claim 2, characterized by the above.

4. The display control means displays a bookshelf image representing a bookshelf having a plurality of shelves on the display unit, and sets a predetermined shelf among the plurality of shelves as the predetermined display area. The display device according to claim 3, characterized by the above.

5. The display control means sets the other shelves among the plurality of shelves as a display area for displaying the appearance image for the plurality of books stored in the predetermined database. The display device according to claim 4, characterized by the above.

6. When the appearance image displayed as the back cover image is specified, the display control means displays the front cover image of the book corresponding to the specified appearance image at a position adjacent to the specified appearance image. The display device according to any one of claims 1 to 5, characterized by the above.

7. The display control means arranges and displays the appearance images of each of the plurality of books to be displayed in the predetermined display area in descending order of browsing frequency. The display device according to any one of claims 1 to 5, characterized by the above.

8. A display method executed by a display device, including a display step of arranging and displaying appearance images representing the appearance of each of a plurality of books in a predetermined display area on a display unit. The display process determines, for each of a plurality of books to be displayed in the predetermined display area, whether to display the appearance image of each book as a front cover image representing the front cover or as a back cover image representing the back cover, based on the browsing frequency of each of the plurality of books to be displayed in the predetermined display area. A display method characterized by this.

9. The computer of the display device functions as display control means for arranging and displaying appearance images representing the appearance of each of a plurality of books in a predetermined display area in the display unit, and the display control means determines, for each of the appearance images of each of the plurality of books to be displayed in the predetermined display area, whether to display it as a front cover image representing the front cover or as a back cover image representing the back cover, based on the browsing frequency of each of the plurality of books to be displayed in the predetermined display area. A program characterized by this.

Images