JP3771826B2 - Book type data difference addition / update device, recording medium for the program, and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention uses a network to display information such as an electronic book, and updates existing information based on difference information between information such as two books, such as updating to the latest information. it relates book type data difference add further refurbished location to build a system that can be added or updated by the difference information.
[0002]
[Prior art]
Conventionally, based on the difference information between two pieces of information, in order to add or update the original information that already exists with the difference information, the difference information that is the result of comparing the two pieces of information is in the following format: It was described in.
(1) In the part where the content has not changed, the position (number of bytes, etc.) from the beginning of the part and the range (number of bytes, etc.) (often defined as other than the part where the content has changed).
(2) The part where the content has changed is the position (number of bytes, etc.), range (number of bytes, etc.) from the beginning of the part, and the content after the change [for example, “10 bytes from the 20th byte from the beginning. “Replace with 4 bytes of“ 00 01 23 52 ””).
(3) The part to which the content is added is the position from the top of the part (number of bytes, etc.) and the additional content [for example, “add 3 bytes of“ 01 20 11 ”to the 30th byte from the top”, etc. (You can also define the range to be 0 bytes where the content is changing)].
[0003]
Then, when applying the difference information, the following additional update processing is performed based on the above description.
(1) In the part where the content has not changed, the original content is copied as it is.
(2) For the part where the contents have changed, the part specified by the position (number of bytes, etc.) from the beginning and the range (number of bytes, etc.) included in the difference information was deleted, and the changed contents were deleted [For example, in the above example, “10 bytes from the 20th byte are deleted, and 4 bytes from the 20th byte are inserted as“ 00 01 2352 ””]
(3) For the part to which the content is added, the additional content is inserted at the position (number of bytes, etc.) from the beginning included in the difference information [for example, in the above example, “01 20 at the 30th byte from the beginning. 11 ”is inserted”.
[0004]
The above processing is repeated until the difference information is completed.
[0005]
[Problems to be solved by the invention]
When using the conventional technology, the description of difference information is not necessarily suitable for information such as books, and is associated with a part of information such as books and pages such as notes and sticky notes added by browsing users. Information may be lost or restored to the same position as the original book information, but the content of the updated page may be moved back and forth, and the results may not be as expected by the browsing user. .
[0006]
An object of the present invention is to display information such as a book on an interface having a physical book structure such as a cover, middle cover, body page, and back cover, imitating a paper book on a computer screen. Adds book-type data difference that can save information such as notes and sticky notes added by the browsing user, including the position if possible, when information added by the browsing user such as notes and sticky notes exists on the page to provide a further newly renovated location.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, page numbers before updating are stored, and page numbers of sticky notes and memos are determined so as to be assigned to page numbers as close as possible after updating. In general, memos are often associated directly with the text, and sticky notes are often associated with the structure of the entire page. Therefore, in the case of a memo, there is little merit of moving to the vicinity of the page when the page disappears, and conversely, there may be a description related to the vicinity of the sticky note, and the position where it is pasted Are often pasted in margins that are far from the text, so move the memo to the inside cover.
[0008]
Specifically, in the present invention, a page-by-page deletion / addition instruction of an electronic book is read and converted into an internal format, and an electronic book to be updated described in the difference file is specified. To do. Next, the specified electronic book file is read, converted into an internal format, and stored. For each page of the electronic book, the page number before the update is managed as a temporary page number, and the page number to which the tag and the memo added by the viewer are added is managed. Necessary pages are deleted and added by executing the script of the difference file, and a temporary page number is determined and managed for the added page based on the added position. The page numbers to which stickers and memos added by the viewer are attached are determined based on the temporary page numbers so that they are as close as possible. Finally, the page number is reset and newly reassigned, and the updated electronic book is stored as a file. Here, managing page numbers and the like means storing and storing information such as page numbers so that they can be referred to when necessary.
[0009]
In the second invention, the update instruction file of the electronic book (the application order of the difference file for performing the update instruction is described in the update number and the storage location of the difference file corresponding to the update number) is read. To convert to internal format. An electronic book to be updated described in the update instruction file is specified, the specified electronic book file is read, converted into an internal format, and stored. Next, for each page of the electronic book, the page number before the update is managed as a temporary page number, and the page number to which the tag and the memo added by the viewer are assigned is managed. The update number of the electronic book is read out, and a difference file that needs to be applied is determined from comparison with the update number of the difference file. The determined difference file is read and converted into an internal format, the page is deleted and added by executing the difference file script, and a temporary page number is determined for the added page based on the added position and managed. To do. In addition, the page numbers to which stickers and memos added by the viewer are attached are determined so as to be as close as possible based on the temporary page numbers. Then reset the page number and reassign it. It is determined whether or not it is necessary to apply the next difference file. If necessary, the same process is repeated from reading the difference file, and if not necessary, the electronic book is stored as a file.
[0010]
In the process of determining page numbers for sticky notes and memos as described above, for memos only, if the page number assigned before the update is not a temporary page number, the memo is properly stored by moving it to the middle cover. Can do.
[0011]
The above means can be realized by a computer and a software program that is installed and executed on the computer, and the program is a computer-readable portable medium memory, semiconductor memory, hard disk, or other suitable recording medium. Can be stored.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the system configuration of a book-type data difference addition / update device according to an embodiment of the present invention.
[0013]
1 includes a script analysis unit 2, a script control unit 3, a book data reading unit 5, a book object management unit 6, an object storage unit 7, a book data writing unit 8, a communication unit 9, a display control unit 10, A difference file 1, which is composed of a display unit 11 and describes difference information of information such as books, is input, and book data 4 stored in a local storage unit of the computer is read or written.
[0014]
FIG. 2 is a diagram for explaining an example of the description method of the difference file 1 in the system shown in FIG. The upper side of FIG. 2A represents information such as the update source book, and the lower side represents information such as the updated book. Each square represents a page in information such as a book, and the information of the update source book includes pages 1 to 9. The information such as the updated book has the same contents as the information of the update source book such as 1, 5, 8, and 9 pages. There are contents N ₃ and N _{4 obtained} by updating the contents of the page.
[0015]
The difference file 1 in FIG. 2B represents a script for creating information such as an updated book from information such as an update source book. From the correspondence between the update source information and the updated information, ,
(1) Delete pages 2, 4, 6, and 7 of the update source information.
(2) Next, insert a new page N ₃ on the third page.
(3) Next, insert a new page N ₄ on the fourth page.
It is a script indicating that such processing is executed.
[0016]
In the difference file 1, “book ID” is information for specifying information such as an update source book, for example, an electronic book name, an ID character string that does not change through the difference addition update process, and a difference addition update target. The URL (Uniform Resource Locator) of the original book data 4 and the number “update number” for specifying the difference addition update are used.
[0017]
FIG. 3 shows an example of how the description of the difference file 1 shown in FIG. 2 is processed in the system shown in FIG. FIG. 4 is a flowchart for the process shown in FIG. 3 in the system shown in FIG.
[0018]
The system reads the difference file 1 by the script analysis unit 2 at the time of execution. The script analysis unit 2 reads the difference file 1 which is a computer readable document (for example, written in XML), converts it into an internal format, and passes it to the script control unit 3 (step S1). The script control unit 3 executes the difference addition update process according to the internal format of the difference file 1. The book object management unit 6 uses the book data reading unit 5, the object storage unit 7, the book data writing unit 8, the communication unit 9, and the display control unit 10 based on the request received from the script control unit 3. Additional update processing and display of information such as books on the display unit 11 are performed.
[0019]
In the script control unit 3, first, according to the internal format of the difference file 1, information specifying information such as an update source book is passed to the book object management unit 6. The book object management unit 6 passes information for specifying information such as the update source book to the book data reading unit 5, and the book data reading unit 5 uses the information for specifying information such as the update source book, The book data 4 existing in the permanent storage area of the computer is specified (step S2) and converted into an internal format.
[0020]
The book data converted into the internal format by the book data reading unit 5 is transferred to the book object management unit 6, and the book object management unit 6 stores the internal format of the book data in the object storage unit 7 (step S3). . At this time, information added by the browsing user such as a memo or a tag attached to the internal format of the book data is also stored at the same time. The “original information” shown at the top of FIG. 3 is an example of information stored here. In this example, the second page of the original information has a tag 20, a memo 22, a sixth page, a memo 23, and an eighth page. A sticky note 21 is added.
[0021]
Next, in accordance with the internal format of the difference file 1, the script control unit 3 gives an instruction “Delete 1 page 2 to 4, 6, 7” to the book object management unit 6. The book object management unit 6 deletes pages 2, 4, 6, and 7 in the internal format of the book data stored in the object storage unit 7 (step S4). At this time, the original page number indicating the page number in the information such as the update source book is stored. Thus, the original page numbers of the book data internal format stored in the object storage unit 7 are 1, 5, 8, and 9 pages.
[0022]
Similarly, the script control unit 3, according to the internal format of the difference file 1, instructions and the "▲ 2 ▼ 3 page to insert a new page N _3", and passes the contents of the new page N ₃ to book the object management unit 6 . The book object management unit 6 inserts the contents of the new page N ₃ into the third page of the internal format of the book data stored in the object storage unit 7 (step S4). At the time of insertion, “original page number” +1 of the page immediately before the insertion position is adopted as the original page number of the new page inserted. Thus, the original page numbers of the book data internal format stored in the object storage unit 7 are 1, 5, 6 (N ₃ ), 8, 9 pages.
[0023]
The same applies to the instruction “( ₃ ) Insert new page N ₄ on the fourth page”. After application, the original page number of the book data internal format stored in the object storage unit 7 is 1, 5, 6 ( N ₃ ), 7 (N ₄ ), 8 and 9 pages.
[0024]
Here, for example, such as "▲ 4 ▼ 5 insert a new page N ₅ on page" and "▲ 5 ▼ 1 page to insert a new page N _1", the page number that is stored as the "original page number" If there is an instruction that overlaps with the page number, the page number is “N”. When the examples ( ₄ ) and (5) are applied, the original page numbers of the book data internal format stored in the object storage unit 7 are N (N ₁ ), 1, 5, 6 (N ₃ ). , 7 (N ₄ ), N (N ₅ ), 8, 9 pages.
[0025]
In the above-mentioned concept of assigning original page numbers, in general, the replacement unit often takes into account the division of chapters and sections. For example, in this example, pages 6 and 8 are updated in one unit (chapter or section). If the number of subsequent pages decreases, the number of pages as a collective unit is considered to have decreased, and if it has increased, the number of pages as a collective unit is considered to have increased. As another method of assigning original page numbers based on another concept, it is conceivable to purely judge only by the amount and to distribute proportionately between empty pages (not necessarily an integer). For example, when 2 to 8 pages are deleted and one page is added, the original page numbers of the book data internal format stored in the object storage unit 7 are 1, 5, and 9 pages ( In the case of the above-mentioned idea of assigning original page numbers, it is 1, 2, 9 pages).
[0026]
When the internal format of the difference file 1 to be processed by the script control unit 3 is finished, the book object management unit 6 is informed of the end. Based on the original page number in the internal format of the book data stored in the object storage unit 7, the book object management unit 6 stores information added by the browsing user such as a memo or a tag attached to the internal format of the book data. Restoration is performed (step S5). At this time, the memo attached to the original page number that has disappeared is moved to the middle cover (intermediate), and the tag is moved to the page having the closest original page number.
[0027]
The “following information” shown at the bottom of FIG. 3 is an example of information restored and stored here. In this example, the memo 23 attached to the original page number 6 is 5 on the third page of the following information. The sticky note 21 attached to the original page number 8 on the page is restored and stored. Further, for the sticky note 20 and the memo 22 attached to the original page number 2, since the page of the original page number 2 has disappeared, the sticky note 20 is restored and stored on the first page, and the memo 22 is displayed on the inner cover. Has been moved. Here, the middle cover is one of the papers that are generally called “look-back” and “play paper”, which have a slightly different color at the beginning of the book cover, or that are attached to the book cover. It is a page (paper). In some cases, it may be considered a kind of “front matter”.
[0028]
When the information added by the browsing user is restored, the book object management unit 6 newly reassigns the page number (step S6), and the internal format of the book data stored in the object storage unit 7 is initially transferred. Along with the information specifying the information such as the update source book, the information is passed to the book data writing unit 8, and the book data writing unit 8 uses the information specifying the information such as the update source book to store the computer permanently. The book data 4 existing in the area is specified, the book data transferred from the book object management unit 6 is converted from the internal format to the file format, and written into the book data 4 (step S7). At this time, information added by the browsing user such as a memo and a tag attached to the internal format of the book data is simultaneously written.
[0029]
Finally, the book object management unit 6 passes the internal format of the book data stored in the object storage unit 7 to the display control unit 10, and the display control unit 10 converts the internal format of the book data to the display unit 11. Based on the drawing, information such as books after the difference addition / update process is displayed.
[0030]
Next, a second embodiment of the present invention will be described with reference to the drawings.
[0031]
The information for specifying information such as the book of the update source described in the difference file 1 is not only information for specifying the book data 4 itself, but also an ID that does not change through the difference addition update process, and the source that is the target of the difference addition update. The URL (Uniform Resource Locator) of the book data 4 and the number “update number” for specifying the difference addition update can be described. In the book data 4, a number “update number” that can identify which update the file was created by can be stored. By writing “previous update information” in the difference file 1, the difference can be retroactively stored. Additional update processing can be performed.
[0032]
FIG. 5 shows an example of the description method of the difference file 1 in the system of the book-type data difference addition / update device according to the second embodiment of the present invention.
[0033]
In the incremental difference update model considered in this embodiment, the difference is always defined for the previous information. Therefore, the update number is automatically specified according to the number “update number” that identifies the incremental difference update. The subject is known to be earlier. In this example, since the number “update number” specifying the difference addition update is “8”, the update number of the book data 4 after using the difference file is known as “8”. Since the update target is automatically recognized as the previous one, there is no update number or the update number is limited to 1-7. When the update number stored in the book data 4 is “2”, the difference addition update process is applied to the book data 4.
[0034]
Now, if the difference is updated properly every time, there is no problem as it is. However, in the second embodiment of the present invention, even if there is a situation where the difference is not updated every time, the “previous file” By describing "update information", it is possible to construct a system that can autonomously manage previous update information without requiring an external system for managing update numbers. In the following description, it is assumed that a URL is used as one means for indicating the storage location of the difference file 1.
[0035]
In “previous update information” described in the difference file 1, an update number (referred to as “no attribute”) performed in the update and a URL of the difference file used in the update can be described. The difference files are applied in the order of update numbers. For example, the value “8” of the “update number” is stored in the difference file 1 and the value “2” of the “update number” is stored in the book data 4, and the “previous update information” included in the difference file 1 is stored. The no attribute is 1, 2, 4, 7, and the URL of the corresponding difference file is “http: //Server/bookA/1.diff”,
“Http: //Server/bookA/2.diff”,
“Http: //Server/bookA/4.diff”,
“Http: //Server/bookA/7.diff”,
In such a case, a difference file having no attributes of “previous update information” of 4 and 7 is used for the current update. In other words, it is not necessary to describe all the update information in the previous update information, and only the previous update information necessary for the current update needs to be described. In this example, it is shown that the book data 4 with the update number “8” can be created even if there is no previous update information whose no attribute is 3, 5, or 6.
[0036]
Here, the information “book ID” for specifying the update target such as the update source book, the number “update number” for specifying the additional difference update, and the “previous update information” are usually described in the difference file 1. However, since it can be handled as a file different from the difference file 1 and it is easier to understand for the sake of explanation, it is referred to as an “update instruction file”.
[0037]
FIG. 6 is a flowchart showing the flow of processing in the system of the book-type data difference addition / update device according to the second embodiment of the present invention.
[0038]
Basically, using the "update instruction file", the necessary difference file is identified, and the process is executed by reverting the application of the difference according to the flow of the difference addition update process shown in FIG. .
[0039]
First, in step S21, the update instruction file 30 is analyzed and converted into an internal format. The update instruction file 30 may be described in the same file as the difference file 1 as shown in FIG.
[0040]
Next, as step S22, the existing book data 4 is specified based on the book ID included in the internal format of the update instruction file 30.
[0041]
After that, as step S3, the book data 4 specified at step S22 is read and converted into an internal format and stored in the object storage unit 7 as in FIG. At this time, data such as notes and sticky notes added by the user is also read and stored.
[0042]
Next, as step S <b> 23, the “update number” stored in the book data 4 is acquired and compared with the “update number” in the update instruction file 30. If the "update number" stored in the book data 4 is larger, the difference is not applied, but if the "update number" in the update instruction file 30 is larger, the update instruction file 30 The “previous update information” is referred to, an entry having a no attribute larger than the “update number” of the book data 4 is specified, and the difference file written in the entry having the smallest no attribute is acquired. When the URL is described in the corresponding entry when acquiring the difference file, the file is acquired from the Internet using the communication unit 9.
[0043]
Similar to FIG. 4, steps S1, S4, S5, and S6 are applied to the difference file obtained in step S23 to execute the difference addition update of the corresponding no attribute.
[0044]
When the difference addition update of the relevant no attribute is executed, in step S24, the “update number” of the book data 4 is updated to the value of the relevant no attribute, and the “previous update information” in the update instruction file 30 is updated. , It is determined whether there is an entry having a no attribute larger than the “update number” of the book data 4. As a result of the determination, if an entry having a no attribute larger than the “update number” of the book data 4 exists, the process branches to step S23, and if not, the process branches to step S7.
[0045]
In step S 7, the internal format of the book data stored in the object storage unit 7 is written in the book data 4 as in FIG. At this time, information added by the browsing user such as a memo and a tag attached to the internal format of the book data is simultaneously written.
[0046]
As described above, information such as books is displayed on the computer screen by imitating a paper book on the interface with the physical book structure such as cover, middle cover, body page, and back cover. When there is information added by the browsing user such as notes and sticky notes on the page, information such as two books is saved while saving the information such as notes and sticky notes added by the browsing user, including the position as much as possible. Based on the difference information between them, the already existing original information can be added or updated with the difference information.
[0047]
【The invention's effect】
As described above, by using the book type data difference adding / updating apparatus according to the present invention, a physical book such as a cover, a middle cover, a text page, and a back cover is imitated on a computer screen. If information such as books is displayed on an interface with the structure of a book, and information added by the browsing user such as notes and sticky notes exists on each page, it is already based on the difference information between the information such as two books. By adding or updating the existing information with the difference information, the size of data exchanged on the network is reduced, and information such as notes and sticky notes added by the browsing user is included as much as possible. This makes it possible to store them.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a system configuration of a book-type data difference adding / updating apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram showing an example of a description method of a difference file in the system shown in FIG.
FIG. 3 is a diagram showing how the description of the difference file shown in FIG. 2 is processed;
FIG. 4 is a processing flowchart of the book-type data difference addition / update device according to the embodiment of the present invention.
FIG. 5 is a diagram showing an example of a differential file description method in the system of the book-type data difference addition / update device according to the second embodiment of the present invention;
FIG. 6 is a process flowchart of the book-type data difference addition / update device according to the second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Difference file 2 Script analysis part 3 Script control part 4 Book data 5 Book data reading part 6 Book object management part 7 Object storage part 8 Book data writing part 9 Communication part 10 Display control part 11 Display part

Claims (8)

In a book-type data difference addition and update device that updates an electronic book based on a difference file in which deletion and addition instructions for an electronic book are described in a script,
Means for reading the difference file;
Means for specifying an electronic book to be updated described in the difference file;
Means for reading the identified electronic book file;
Means for managing the page number before update as a temporary page number for each page of the electronic book, and managing the page number to which a tag and a memo added by the viewer are attached;
Means for executing the script of the difference file, deleting and adding a page, and determining and managing a temporary page number based on the added position for the added page;
A means for determining the page numbers to which stickers and memos added by the viewer are as close as possible based on the temporary page numbers;
A book-type data difference addition / update device comprising: means for resetting a page number, re-assigning a new page, and storing the updated electronic book as a file. In a book-type data difference addition and update device that updates an electronic book based on a difference file in which deletion and addition instructions for an electronic book are described in a script,
Means for reading the update instruction information described in the update file number and the storage location of the difference file corresponding to the update number;
Means for specifying an electronic book to be updated described in the update instruction information;
Means for reading the identified electronic book file;
Means for managing the page number before update as a temporary page number for each page of the electronic book, and managing the page number to which a tag and a memo added by the viewer are attached;
Means for reading an update number of the electronic book and comparing the difference number with the update number of the difference file ;
Means for reading the difference file;
A means of executing a script of the read difference file, deleting and adding pages, determining a temporary page number based on the added position for the added page, and managing the page;
A means for determining the page numbers to which stickers and memos added by the viewer are as close as possible based on the temporary page numbers;
Means to reset the page number and re-assign it,
A book-type data difference addition characterized by having a means for determining whether or not the next difference file needs to be applied and repeating the reading of the difference file if necessary and storing the electronic book as a file if unnecessary. Update device. In the means for determining the page number of the tag and memo,
Only notes before update page number has been assigned to is to be in the temporary page number, according to claim 1 or claim 2, wherein further comprising means for transferring a medium cover book type data difference Add update apparatus. Computer-readable recording of a program for causing a computer constituting a book-type data difference addition / update device to update an electronic book based on a difference file in which deletion / addition instructions are written in scripts in an electronic book. Recording medium,
Said computer,
Means for reading the difference file;
Means for specifying an electronic book to be updated described in the difference file;
Means for reading the identified electronic book file;
Means for managing the page number before update as a temporary page number for each page of the electronic book, and managing the page number to which a tag and a memo added by the viewer are attached;
Means for executing the script of the difference file, deleting and adding a page, and determining and managing a temporary page number based on the added position for the added page;
A means for determining the page numbers to which stickers and memos added by the viewer are as close as possible based on the temporary page numbers;
As a means of resetting the page number, re-assigning it, and storing the updated e-book as a file,
A recording medium for a book-type data difference addition / update program, wherein a program for causing it to function is recorded. Computer-readable recording of a program for causing a computer constituting a book-type data difference addition / update device to update an electronic book based on a difference file in which deletion / addition instructions are written in scripts in an electronic book. Recording medium,
Said computer,
  Means for reading the update instruction information described in the update file number and the storage location of the difference file corresponding to the update number;
Means for specifying an electronic book to be updated described in the update instruction information;
Means for reading the identified electronic book file;
Means for managing the page number before update as a temporary page number for each page of the electronic book, and managing the page number to which a tag and a memo added by the viewer are attached;
Means for reading an update number of the electronic book and comparing the difference number with the update number of the difference file;
Means for reading the difference file;
A means of executing a script of the read difference file, deleting and adding pages, determining a temporary page number based on the added position for the added page, and managing the page;
A means for determining the page numbers to which stickers and memos added by the viewer are as close as possible based on the temporary page numbers;
Means to reset the page number and re-assign it,
As a means to determine whether or not the next difference file needs to be applied, and to repeat the reading from the difference file if necessary, and to store the electronic book as a file if unnecessary.
A recording medium for a book-type data difference addition / update program, wherein a program for causing it to function is recorded. In the recording medium of the book type data difference addition update program according to claim 4 or 5,
Said computer,
In the means for determining the page number of the tag and memo,
For memos only, if the page number that was assigned before the update is not a temporary page number,
A recording medium for a book-type data difference addition / update program, wherein a program for causing it to function is recorded. A book-type data difference addition / update program for causing a computer constituting the book-type data difference addition / update device to update an electronic book based on a difference file in which deletion / addition instructions of the electronic book are described in a script. Because
Said computer,
Means for reading the difference file;
Means for specifying an electronic book to be updated described in the difference file;
Means for reading the identified electronic book file;
Means for managing the page number before update as a temporary page number for each page of the electronic book, and managing the page number to which a tag and a memo added by the viewer are attached;
Means for executing the script of the difference file, deleting and adding a page, and determining and managing a temporary page number based on the added position for the added page;
A means for determining the page numbers to which stickers and memos added by the viewer are as close as possible based on the temporary page numbers;
As a means of resetting the page number, re-assigning it, and storing the updated e-book as a file,
Book type data difference addition update program to make it function. A book-type data difference addition / update program for causing a computer constituting the book-type data difference addition / update device to update an electronic book based on a difference file in which deletion / addition instructions of the electronic book are described in a script. Because
Said computer,
  Means for reading the update instruction information described in the update file number and the storage location of the difference file corresponding to the update number;
Means for specifying an electronic book to be updated described in the update instruction information;
Means for reading the identified electronic book file;
Means for managing the page number before update as a temporary page number for each page of the electronic book, and managing the page number to which a tag and a memo added by the viewer are attached;
Means for reading an update number of the electronic book and comparing the difference number with the update number of the difference file;
Means for reading the difference file;
A means of executing a script of the read difference file, deleting and adding pages, determining a temporary page number based on the added position for the added page, and managing the page;
A means for determining the page numbers to which stickers and memos added by the viewer are as close as possible based on the temporary page numbers;
Means to reset the page number and re-assign it,
As a means to determine whether or not the next difference file needs to be applied, and to repeat the reading from the difference file if necessary, and to store the electronic book as a file if unnecessary.
Book type data difference addition update program to make it function.

Images