JP2008122519A - Administration apparatus and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to transmit document data to an optimum information display device taking into consideration the battery remainder. <P>SOLUTION: The administration apparatus comprises; a communication interface which communicates with a plurality of information display devices each having a battery; a receiving means which receives the battery remainder from each information display device connected via the communication interface; a data storage means which stores the document data; a parameter storage means which stores the battery remainder necessary for displaying one page of the document data in the information display device; a calculation means which calculates the number of pages that can be browsed based on the battery remainder stored in the parameter storage means; and a transmitting means which transmits the document data to the information display device satisfying the conditions that the parameter calculated based on the number of pages that can be browsed calculated by the calculation means exceeds the number of the pages of the document data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for managing a plurality of information display devices.

  An information display device having a memory liquid crystal such as a cholesteric liquid crystal is known. Such an information display device has an advantage that data can be rewritten and an advantage that it is convenient to carry. Document data displayed on the information display device is input via a server or a personal computer (hereinafter referred to as a PC). Here, the memory capacity or battery capacity of the information display device is finite. Of these resources, usable portions, that is, the remaining memory capacity and the remaining battery capacity differ depending on individual information display devices. Therefore, when considering a system having a plurality of information display devices, the information display device to which the document data is transmitted greatly affects the convenience of the system.

  The present invention relates to a technique for transmitting document data to an optimal information display device in consideration of at least a remaining battery level in a system having a plurality of information display devices.

In order to solve the above-described problems, the present invention provides a communication interface that communicates with a plurality of information display devices each having a battery, and reception that receives a remaining battery level from each information display device connected via the communication interface. Means, data storage means for storing document data, parameter storage means for storing battery consumption necessary for displaying one page of the document data in the information display device, and remaining battery power received by the receiving means. A calculation means for calculating the number of viewable pages based on the amount and the battery consumption stored in the parameter storage means, and a parameter calculated based on the number of viewable pages calculated by the calculation means is the document. For the information display device that satisfies the condition indicating that the number of data pages has been exceeded, the document data Providing a management device and a transmission means for transmitting the data.
According to this management apparatus, document data can be transmitted to an optimal information display apparatus in consideration of the remaining battery level.

In a preferred aspect, in the management device, each of the plurality of information display devices includes a memory, the receiving unit receives a remaining memory amount from each of the information display devices, and the parameter storage unit is configured to display the information display. A memory consumption amount required to display one page of the document data in the apparatus is stored, and the calculation unit calculates the number of storable pages based on the remaining memory amount and the memory consumption amount, and the transmission unit However, the document data is transmitted to an information display device that satisfies the condition that the parameter calculated based on the number of pages that can be viewed and the number of pages that can be stored exceeds the number of pages of the document data. May be.
According to this management apparatus, the document data can be transmitted to the optimum information display apparatus in consideration of the remaining battery capacity and the remaining memory capacity.

であってもよい。ただし、Ｃはバッテリ残量であり、ｗはバッテリ消費量であり、Ｍはメモリ残量であり、ｍはメモリ消費量であり、Ｙは文書データのページ数であり、ａおよびｂは定数である。
この管理装置によれば、バッテリ残量およびメモリ残量を考慮して、最適な情報表示装置に文書データを送信することができる。 In another preferred embodiment, the management device has the above condition:

It may be. Where C is the remaining battery capacity, w is the battery consumption, M is the remaining memory capacity, m is the memory consumption, Y is the number of pages of document data, and a and b are constants. is there.
According to this management apparatus, the document data can be transmitted to the optimum information display apparatus in consideration of the remaining battery capacity and the remaining memory capacity.

In still another preferred aspect, the management device includes a dividing unit that divides the document data into two or more new document data when an information display device that satisfies the condition is not connected, and the transmission unit includes The divided document data may be transmitted to an information display device that satisfies a condition indicating that the parameter exceeds the number of pages of the divided document data.
According to this management apparatus, document data can be transmitted even when there is no information display apparatus that satisfies the conditions.

In still another preferred aspect, the management device is configured to display at least one of the divided document data as data for causing the information display device to display an image specifying the information display device to which the divided document data is transmitted. You may have an addition means to add to one document data.
According to this management apparatus, the user can know the context of the divided document data.

In yet another preferred aspect, the management device reads data stored in one information display device among the plurality of information display devices when an information display device that satisfies the conditions is not connected, A transfer means for transmitting to the information display device, wherein the reception means receives the remaining memory capacity from the information display apparatus after the transfer, and the calculating means determines the remaining memory capacity and the consumed memory amount after the transfer. Based on this, the number of pages that can be stored may be calculated.
According to this management apparatus, document data can be transmitted even when there is no information display apparatus that satisfies the conditions.

The present invention also provides a communication interface for communicating with a plurality of information display devices each having a battery, data storage means for storing document data, and display of one page of the document data in the information display device. A reception step of receiving a battery remaining amount from each information display device connected via the communication interface to a computer device having parameter storage means for storing a battery consumption amount; and the received battery remaining amount; and A calculation step for calculating the number of viewable pages based on the battery consumption stored in the parameter storage means, and a parameter calculated based on the calculated number of viewable pages exceeds the number of pages of the document data. The document data is transmitted to the information display device that satisfies the condition indicating Providing a program for executing a signal step.
According to this program, document data can be transmitted to an optimal information display device in consideration of the remaining battery level.

1. First embodiment 1-1. Configuration FIG. 1 is a block diagram showing a functional configuration of a management system 1 according to the first embodiment. The management system 1 includes a management device 100 and a plurality of information display devices 200. Although three information display devices 200 are shown in FIG. 1, the number of information display devices 200 is not limited to three. The three information display devices are distinguished by using subscripts such as 200a, 200b, and 200c. The same applies to the components of the information display device. When it is not necessary to distinguish between them, the information display device 200 is simply described.

  The information display device 200 includes a battery 201 and a memory 202. The battery 201 and the memory 202 have finite storage capacity and storage capacity. The function of the management apparatus 100 is as follows. The data receiving unit 101 receives the battery remaining amount and the memory remaining amount from the information display device 200. The battery remaining amount refers to the electric power currently stored in the battery 201. The remaining memory capacity is an unused storage capacity of the storage capacity of the memory 202. The storage unit 102 stores document data D and parameters P. The document data D is data indicating a document (image) displayed on the information display device 200. The document data D includes a plurality of pages of images. The parameter P includes a battery capacity (hereinafter referred to as “battery consumption”) required to display one page image and a memory capacity (hereinafter referred to as “memory”) required to store one page image in the information display apparatus 200. Consumption ”). The control unit 103 calculates the number of pages that can be browsed based on the remaining battery level and the battery consumption. Further, the control unit 103 calculates the number of storable pages based on the remaining memory capacity and the memory consumption. Details of these parameters will be described later. The data transmission unit 104 transmits the document data D to the information display device 200 that satisfies a certain condition. The “certain condition” is a condition indicating that a parameter relating to the number of pages calculated based on at least the number of viewable pages exceeds the number of pages of the document data D.

  FIG. 2 is a block diagram illustrating a hardware configuration of the management apparatus 100. A CPU (Central Processing Unit) 110 is a control device that controls each component of the management device 100. A ROM (Read Only Memory) 120 is a storage device that stores data and programs necessary for starting the management apparatus 100. A RAM (Random Access Memory) 130 is a storage device that functions as a work area when the CPU 110 executes a program. An I / F (Interface) 140 is an interface for inputting / outputting data and control signals to / from various input / output devices and storage devices. An HDD (Hard Disk Drive) 150 is a storage device that stores various programs and data. Regarding the present embodiment, the HDD 150 stores a control program for controlling the operation of the management apparatus 100. The keyboard / mouse 160 is an input device for a user to input an instruction to the management apparatus 100. The display 170 is an output device that displays data contents or processing status. The network IF 180 is an interface for transmitting and receiving data to and from other devices connected via a network (not shown). For example, the management apparatus 100 can receive a document (more precisely, electronic data indicating the document) via the network and the network IF 180. The communication IF 181 is an interface that communicates with the information display apparatus 200. The communication IF 181 performs communication based on standards such as USB (Universal Serial Bus), Blue Tooth (registered trademark), and wireless LAN (Local Area Network). Further, the communication IF 181 can connect a plurality of information display devices 200 to the management device 100. CPU 110, ROM 120, RAM 130, and I / F 140 are connected via a bus 190. When the CPU 110 executes the control program, the management device 100 has the functional configuration shown in FIG. The management device 100 may be any device as long as it includes the functional configuration shown in FIG. 1 and the hardware configuration shown in FIG. For example, the management device 100 may be a so-called personal computer.

  FIG. 3 is a block diagram illustrating a hardware configuration of the information display device 200. The CPU 210 is a control device that controls elements of the information display device 200. The ROM 220 is a storage device that stores programs and data necessary for the operation of the information display device 200. The RAM 230 is a storage device that functions as a work area when the CPU 210 executes a program. A video random access memory (VRAM) 231 is a storage device that stores an image to be displayed on the display device 251. An I / O (Input / Output) 240 is an input / output interface. The key button 241 outputs a signal corresponding to a user operation to the I / O 240.

  The display control unit 250 drives the display device 251 according to the image data stored in the VRAM 231. The display device 251 is a display device having a memory liquid crystal layer such as a cholesteric liquid crystal. The power supply control unit 260 is a control device that controls the supply of power from the battery 261. The battery 261 is a secondary battery such as a Ni—Cd battery or a Li ion battery. The communication control unit 270 is a control device that controls communication with other devices via the communication IF 271. The communication IF 271 is an interface that performs communication conforming to standards such as USB, Blue Tooth (registered trademark), and wireless LAN. The storage device control unit 280 is a control device that controls the internal storage device 281 and the removable medium 283. The internal storage device 281 is a rewritable nonvolatile storage device such as a flash memory. The removable medium 283 is a removable storage device connected to the information display device 200 via the memory IF 282. The removable medium 283 is, for example, an SD (registered trademark) memory card or a memory stick (registered trademark). The above elements are connected via a bus 290.

1-2. Operation FIG. 4 is a flowchart showing the operation of the management system 1 according to the first embodiment. At the time of starting this flow, the management device 100 and the three information display devices 200 are connected (for example, wired connection according to the USB standard). The flow shown in FIG. 4 may be triggered by any event. For example, this flow may be triggered by the user inputting an instruction via the keyboard / mouse 160. Alternatively, this flow may be started periodically every time a predetermined time elapses.

  In step S <b> 100, the management device 100 receives the battery remaining amount and the memory remaining amount from the information display device 200. Specifically, it is as follows. The CPU 110 transmits a request for requesting transmission of the remaining battery capacity and the remaining memory capacity to all the information display devices 200 connected via the communication IF 181. When receiving the request, each information display device 200 transmits a response including its own battery remaining amount and memory remaining amount to the management device 100. When receiving the response, the CPU 110 of the management apparatus 100 extracts the remaining battery capacity and the remaining memory capacity from the response. The CPU 110 stores the remaining battery capacity and the remaining memory capacity in the RAM 130 together with the identifier of the corresponding information display device 200.

  In step S110, the management apparatus 100 calculates the number of pages that can be browsed. Specifically, it is as follows. The number of pages that can be browsed is defined by (C / w). Here, C is the remaining battery capacity, and w is the battery consumption. The HDD 150 stores an identifier of the information display device 200 and a battery consumption amount in the information display device 200 in advance. CPU 110 calculates the number of pages that can be browsed using battery remaining amount C and battery consumption w. Further, the CPU 110 calculates the number of pages that can be stored. The number of pages that can be stored is defined by (M / m). Here, M is the remaining memory capacity, and m is the memory consumption. The HDD 150 stores an identifier of the information display device 200 and a memory consumption amount in the information display device 200 in advance. CPU 110 calculates the number of pages that can be stored using remaining memory M and memory consumption m. The battery consumption amount and the memory consumption amount are not stored in the HDD 150 in advance, but may be acquired from the information display device 200 each time the flow of FIG. 4 is executed. The management device 100 calculates the number of pages that can be browsed and the number of pages that can be stored for each information display device 200.

In step S120, the management apparatus 100 selects the information display apparatus 200 that satisfies a predetermined condition. Specifically, it is as follows. CPU 110 determines whether the parameter calculated based on the number of pages that can be browsed and the number of pages that can be stored satisfies the condition represented by the following equation.

Here, Y is the number of pages of document data. A and b are constants. For example, if each page is viewed once, a = b = 1. Alternatively, if each page is viewed twice, a = b = 2. In addition, the conditions used here are not limited to what is shown by Formula (1). For example, a condition represented by the following formula may be used. In this case, the management apparatus 100 does not need to acquire the remaining memory capacity from the information display apparatus 200, and does not need to store the memory consumption in advance.

  CPU110 selects the information display apparatus 200 which satisfy | fills said conditions from the information display apparatuses 200 connected via communication IF181. When there are a plurality of information display devices 200 that satisfy this condition, the CPU 110 selects one information display device 200 from them. The algorithm for selecting one information display device 200 is arbitrary. For example, the CPU 110 may select the information display device 200 in which the parameter on the left side of Expression (1) is maximum. Alternatively, the CPU 110 may select one information display device 200 at random.

  In step S130, CPU 110 transmits document data D to selected information display device 200 (for example, information display device 200a). When the document data D is received, the CPU 210a of the information display device 200a stores the document data D in the internal storage device 281a. Thereafter, even after the connection between the information display device 200a and the management device 100 is released, the information display device 200a can browse the document according to the document data D.

2. Second Embodiment Subsequently, a second embodiment of the present invention will be described. In the following description, the description of matters common to the first embodiment is omitted. Elements common to the first embodiment will be described using common reference numerals. In the second embodiment, when there is no information display device that can view the document data, the document data is divided.

  FIG. 5 is a flowchart showing the operation of the management system 1 according to the second embodiment. The processing in steps S100 to S120 is as described in the first embodiment. In step S200, the CPU 110 determines whether there is an information display device 200 that satisfies the condition. When it is determined that there is an information display device 200 that satisfies the condition (step S200: YES), the CPU 110 transmits the document data D to the information display device 200 (step S130).

When it is determined that there is no information display device 200 that satisfies the condition (S200: NO), in step S210, the CPU 110 divides the document data D into two or more new document data. In the present embodiment, the CPU 110 divides the document data D into two new document data. The document data after division of document data D ₁ and document data D _2. A method for dividing the document data D is arbitrary. For example, the document data D may be divided so that the document data D ₁ and the document data D _{2 have} the same number of pages. When the document data D is an odd-numbered page document, the document data D ₁ and the document data D ₂ may be divided so that the difference in the number of pages is one page. Alternatively, the number of page document data D ₁ may be divided such that the maximum value of the left side of the square root of equation (1). Further alternatively, the number of page document data D ₁ may be divided such that the maximum value of viewable pages. Further alternatively, when the document data D is divided into “chapter” and “section”, the document data D may be divided for each division.

When the document data D is divided, CPU 110, to the document data after division (document data _{D 1} and the document data _{D 2),} repeatedly executes step S120 and subsequent steps.

FIG. 6 is a diagram for explaining the operation of the second embodiment. Now, the case where the expression (2) is used as a condition will be described as an example. Document data D is a document composed of 80 pages. The browseable page numbers of the information display devices 200a, 200b, and 200c are 50 pages, 40 pages, and 30 pages, respectively. Since there is no information display device having 80 or more pages that can be browsed, the CPU 110 divides the document data D into two document data (document data D ₁ and document data D ₂ ). Here, CPU 110, the number of page document data D ₁ is, to be equal to the maximum value of viewable pages, divides the document data D. Here, since the maximum value of the number of pages that can be browsed is 50 pages, the CPU 110 divides the _first 50 pages of the document data D as the document data D ₁ and the remaining 30 pages as the document data D ₂ . CPU110 is document data _{D 1} to the information display device 200a, the document data _{D 2} to the information display device 200b, and transmits respectively.

Incidentally, CPU 110, at the time of dividing the document data D _1, the information indicating the location of the family data generated by the division may be added to the document data after division. Here, “family data” refers to a group of document data generated by dividing from one document data. For example, the document data D is divided into _two document data (document data D ₁ and document data D ₂ ), and the document data D ₁ is further divided into two document data (document data D ₁₁ and document data D ₁₂ ). In this case, the document data D ₁₁ , the document data D ₁₂ and the document data D ₂ are family data.

FIG. 7 is a diagram illustrating information added to a document. For example, information indicating the location of the document data D ₂ (that is, the information display device to which the document data D ₂ is transmitted) is added to the last page of the document data D ₁ . Here, a message “Continued from apparatus 200b” is added. The place where such information is added is not limited to the last page. Such information may be added to the first page or other pages. Further, the added information is not limited to information indicating the location of the document data subsequent to the document data. Any information may be added as long as the information indicates the location of at least a part of the family data. For example, when the document data is divided into three or more, information indicating the location of each document data, such as “Chapter 1 is apparatus 200a, Chapter 2 is apparatus 200b, and Chapter 3 is apparatus 200c”. May be added.

3. Third Embodiment Subsequently, a third embodiment of the present invention will be described. In the following description, descriptions of matters common to the first and second embodiments are omitted. In addition, elements common to the first and second embodiments will be described using common reference numerals. In the third embodiment, when there is no information display device capable of browsing document data, data already stored in the information display device is transferred to another information display device.

  FIG. 8 is a flowchart showing the operation of the management system 1 according to the third embodiment. The processing in steps S100 to S120 is as described in the first embodiment. In step S300, the CPU 110 determines whether there is an information display device 200 that satisfies the condition. When it is determined that there is an information display device 200 that satisfies the condition (step S300: YES), the CPU 110 transmits the document data D to the information display device 200. Here, the condition that the number of pages that can be stored is equal to or greater than the number of pages of the document is used.

  When it is determined that there is no information display device 200 that satisfies the condition (step S300: NO), in step S310, the CPU 110 transfers data stored in a certain information display device to another information display device. The CPU 110 determines a transfer source information display device and a transfer destination information display device from the connected information display devices 200. Any algorithm may be used as an algorithm for determining the transfer source and the transfer destination. The CPU 110 transfers data from the transfer source information display device to the transfer destination information display device. When the data transfer is completed, the CPU 110 repeatedly executes the processes after step S110.

  FIG. 9 is a diagram illustrating a state before transfer according to the third embodiment. The information display devices 200a, 200b, and 200c can store 30 pages, 70 pages, and 50 pages. The information display devices 200a, 200b, and 200c already store document data for 70 pages, 30 pages, and 50 pages, respectively.

  For example, the CPU 110 determines the information display device having the maximum number of storable pages, here the information display device 200b as the transfer source. The CPU 110 transmits a request for requesting the transfer source to transmit the capacity of already stored data (that is, data to be transferred). When receiving the request, the information display apparatus 200b transmits to the management apparatus 100 a response including the capacity of the document data already stored in the information display apparatus 200b, in this case, information “30 pages”. The capacity of the document data may be represented not by the number of pages but by the amount of data (kilobyte, megabyte, etc.).

  Next, the CPU 110 transfers the information display device having the storable page number larger than the number of pages of the transfer target data and the smallest storable page number from the information display devices other than the transfer source to the transfer destination. Determine as. Here, the information display device 200a is determined as the transfer destination. The CPU 110 reads the transfer target data from the transfer source. That is, the transfer target data is stored in the HDD 150. When it is confirmed that the data is stored in the management device 100, the information display device 200b deletes the transfer target data from the internal storage device 281b.

  Next, the CPU 110 of the management apparatus 100 transmits the transfer target data to the information display apparatus 200a that is the transfer destination. The information display device 200a stores the transfer target data in the internal storage device 281a.

  FIG. 10 is a diagram illustrating a state after the transfer. By the transfer described above, the number of pages that can be stored in the information display devices 200a, 200b, and 200c is 0 pages, 100 pages, and 50 pages. Since the document data D is 80 pages now, it can be transmitted to the information display device 200b.

4). Other Embodiments The present invention is not limited to the above-described embodiments, and various modifications can be made.
In the second embodiment, the example in which Expression (2) is used as a condition, that is, the example in which the number of viewable pages is used as a parameter has been described. However, as described in the first embodiment, other conditions such as Expression (1) may be used. In the third embodiment, a condition relating to the number of storable pages is used. However, other conditions may be used.

  Although 2nd Embodiment and 3rd Embodiment were each demonstrated separately, you may combine these. That is, data transfer may be performed when there is no information display device that satisfies the conditions even when divided. Alternatively, if there is no information display device that satisfies the condition even after data transfer, document data may be divided.

  In the above-described embodiment, the example in which the control program is stored in the HDD 150 has been described. However, the control program may be provided by a storage medium such as a CD-ROM (Compact Disk Read Only Memory).

  The management system 1 may be used as a library or a library room system. In this case, the document data is book data, and the management apparatus 100 is a server device that stores a plurality of book data. The plurality of information display devices 200 are placed on a bookshelf. A user of the library inputs information for specifying a book to be lent out to the server device. The server device transmits the specified book data to one or a plurality of information display devices 200 by the above processing. At this time, the information display device 200 in which the book data is stored may be notified to the user. For example, even if the information display device 200 has a display element such as an LED (Light Emitting Diode) and the user is notified that data is stored in the information processing device by turning on the LED. Good. Alternatively, a display may be provided on the bookshelf, and information indicating an information display device in which data is stored may be displayed on the display. In this case, the display and the server device need to be connected.

It is a block diagram which shows the function structure of the management system 1 which concerns on 1st Embodiment. 2 is a block diagram illustrating a hardware configuration of a management apparatus 100. FIG. 2 is a block diagram showing a hardware configuration of an information display device 200. FIG. It is a flowchart which shows operation | movement of the management system 1 which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of the management system 1 which concerns on 2nd Embodiment. It is a figure explaining operation | movement of 2nd Embodiment. It is a figure which illustrates the information added to a document. It is a flowchart which shows operation | movement of the management system 1 which concerns on 3rd Embodiment. It is a figure which shows the state before the transfer which concerns on 3rd Embodiment. It is a figure which shows the state after transfer.

Explanation of symbols

D · D ₁ · D ₂ ... document data, 1 ... management system, 100 ... management device, 101 ... data receiving unit, 102 ... storage unit, 103 ... control unit, 104 ... data transmission unit, 110 ... CPU, 120 ... ROM , 130 ... RAM, 140 ... I / F, 150 ... HDD, 160 ... keyboard / mouse, 170 ... display, 180 ... network IF, 181 ... communication IF, 190 ... bus, 200 ... information display device, 201 ... battery, 202 ... Memory, 210 ... CPU, 220 ... ROM, 230 ... RAM, 231 ... VRAM, 240 ... I / O, 241 ... Key button, 250 ... Display control unit, 251 ... Display device, 260 ... Power supply control unit, 261 ... Battery 270 ... Communication control unit, 271 ... Communication IF, 280 ... Storage device control unit, 281 ... Built-in storage device, 282 ... Memory IF 283 ... removable media, 290 ... bus

Claims (7)

A communication interface for communicating with a plurality of information display devices each having a battery;
Receiving means for receiving the remaining battery level from each information display device connected via the communication interface;
Data storage means for storing document data;
Parameter storage means for storing battery consumption required to display one page of the document data in the information display device;
Calculating means for calculating the number of viewable pages based on the remaining battery level received by the receiving means and the battery consumption stored in the parameter storage means;
Transmission means for transmitting the document data to an information display device that satisfies a condition indicating that the parameter calculated based on the number of viewable pages calculated by the calculation means exceeds the number of pages of the document data And a management device. Each of the plurality of information display devices has a memory,
The receiving means receives the remaining memory capacity from the information display devices;
The parameter storage means stores a memory consumption necessary for displaying one page of the document data in the information display device;
The calculation means calculates the number of storable pages based on the remaining memory capacity and the memory consumption amount,
The document data is transmitted to the information display device that satisfies the condition indicating that the parameter calculated based on the number of pages that can be browsed and the number of pages that can be stored exceeds the number of pages of the document data. The management apparatus according to claim 1, wherein: The condition is

The management apparatus according to claim 2, wherein:
However,
C is the remaining battery capacity,
w is the battery consumption,
M is the remaining memory capacity,
m is the memory consumption,
Y is the number of pages of the document data,
a and b are constants. When an information display device that satisfies the conditions is not connected, the document data includes a dividing unit that divides the document data into two or more new document data,
2. The divided document data is transmitted to an information display device that satisfies a condition indicating that the parameter exceeds the number of pages of the divided document data. The management device according to any one of items 1 to 3. And adding means for adding data for causing the information display device to display an image specifying the information display device to which the divided document data is transmitted, to at least one document data of the divided document data. The management apparatus according to claim 4, wherein the management apparatus is characterized in that: When an information display device that satisfies the above conditions is not connected, it has transfer means for reading data stored in one information display device among the plurality of information display devices and transmitting it to another information display device,
The receiving means receives the remaining memory capacity from the information display device after the transfer,
The management device according to claim 2, wherein the calculation unit calculates the number of storable pages based on the remaining memory capacity and the memory consumption after the transfer. A communication interface for communicating with a plurality of information display devices each having a battery, data storage means for storing document data, and a battery consumption amount required for displaying one page of the document data in the information display device A computer device having parameter storage means;
A receiving step of receiving a battery remaining amount from each information display device connected via the communication interface;
A calculation step of calculating the number of viewable pages based on the received battery remaining amount and the battery consumption stored in the parameter storage unit;
A transmission step of transmitting the document data to an information display device that satisfies a condition indicating that a parameter calculated based on the calculated viewable page number exceeds the number of pages of the document data. Program to make.

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