JP2014134876A - Communication terminal and synchronization method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication terminal and its synchronization method capable of appropriately managing unconformity in information related to mails between a so-called cloud server and a communication terminal, when using the cloud server.SOLUTION: A data processing unit 102 executes processing received by an operation control unit 101, and a processing result management unit 103 generates a processing result file which uses a character string based on the processing result of the received operation as a file name. A processing result file storage unit 105 stores the generated processing result file, the processing result management unit 103 reads the processing result from the file name of the stored processing result file at predetermined timing, and a communication unit 108 executes synchronization processing between a communication terminal and a mail server which stores email data according to the processing result. In this way, a processing load caused by the synchronization processing can be reduced, and the processing can be speedily performed.

Description

  The present invention relates to a communication terminal and a synchronization method for synchronizing electronic mail data.

  When a new electronic mail is received by a mail server, a mail system in a conventional mobile terminal such as a mobile phone notifies the mobile terminal to that effect or distributes the electronic mail. For example, Patent Document 1 below describes that database synchronization is performed between a mail server and a portable computing device. More specifically, in the database synchronization method described in Patent Document 1, when a mail is received by a mail server, the mobile computing device is notified of the fact, and the mobile computing device acquires the mail from the mail server. can do.

JP 2001-274841 A

  In recent years, a system has been considered in which a plurality of communication terminals have the same mail account using cloud technology, and the communication terminals transmit and receive electronic mail related to the same mail account. In this system, e-mail data (including header information and bibliographic information, as well as e-mail text and attached files) is stored on the cloud server. (Title, destination, etc.) and bibliographic information (various statuses for e-mail data, etc.) only. And when a user browses each electronic mail data, a communication terminal can display a mail text and an attached file by acquiring a mail text and an attached file from a cloud server.

  In a mail system using such cloud technology, a user can operate e-mail data held in a communication terminal without connecting to a mail server. For example, by operating a communication terminal, a user creates a new folder in a mailbox held in the communication terminal, deletes e-mail data from the mailbox, or renames a folder or the like be able to. In this case, since only the e-mail data and folder held in the communication terminal are changed, the server and the communication terminal are not changed unless the same change is made to the e-mail data and folder held in the mail server. Inconsistency occurs in the stored e-mail data and folders.

  Therefore, in the present invention, there is provided a communication terminal capable of appropriately matching information regarding mail between the mail server and the communication terminal when using a mail server such as a so-called cloud server, and a synchronization method thereof. With the goal.

  In order to solve the above-described problem, a communication terminal according to the present invention includes a data storage unit that stores email data by distinguishing each folder, and an operation unit that receives an operation on the email data or the folder stored in the data storage unit. A process execution unit that executes a process according to the operation received by the operation unit, and a file that generates a process result file with a character string based on the process result of the operation received by the operation unit as a file name A processing result storage means for storing the processing result file generated by the file generation means, and a processing result from the file name of the processing result file stored in the processing result storage means at a predetermined timing. Read and synchronize with a mail server that stores email data And a, a synchronization means for taking.

  Further, the synchronization method of the present invention is an operation for accepting an operation on the e-mail data or the folder stored in the data storage means in the synchronization method in the communication terminal including the data storage means for distinguishing and storing the e-mail data for each folder. Generating a processing result file having a file name as a character string based on a processing result of the step, a processing execution step for executing processing according to the operation received by the operation step, and a processing result of the operation received by the operation step A file generation step, a storage step of storing the processing result file generated by the file generation step in the processing result storage unit, and a file name of the processing result file stored in the processing result storage unit at a predetermined timing Read processing result from Te, and a synchronization step of synchronizing with the mail server that stores electronic mail data.

  The present invention executes a received process and generates a process result file having a character string based on a process result of the accepted operation as a file name. Then, the generated processing result file is stored, the processing result is read from the file name of the stored processing result file at a predetermined timing, and is synchronized with the mail server that stores the e-mail data. As a result, the processing load due to the synchronous processing can be reduced, and the processing result is described in the file name, so that the processing result can be read without opening the file, and the processing can be performed quickly. It can be carried out.

  In addition, as a predetermined timing, when an explicit synchronization operation is performed by the user, a certain number of processing result files are stored in the processing result storage unit, a communication connection with the mail server, or For example, the synchronization process may be performed when at least one of the predetermined time has elapsed after the synchronization means has synchronized.

  In the communication terminal of the present invention, the file generation unit generates a processing result file including a status before change and a status after change in e-mail data or a folder.

  The processing result file according to the present invention includes the status before the change and the status after the change, and the status before and after the status is clarified, so that accurate processing can be performed.

  In the communication terminal of the present invention, the file generation means generates a processing result file including the status before change and user operation information in the e-mail data or folder.

  The processing result file in the present invention includes the status before the change and the operation information of the user. By clarifying these, the accurate processing can be performed. In the communication terminal according to the present invention, the file generation unit generates a processing result file including a type indicating an operation target among e-mail data or a folder.

  The processing result file according to the present invention includes the type indicating the operation target, so that accurate processing for the operation target can be performed.

  In the communication terminal of the present invention, the file generation means generates a processing result file that does not include entity data.

  Since the processing result file in the present invention does not include actual data, it does not occupy the memory block of the storage means, and uses only the management information area. Therefore, the memory consumption can be extremely reduced, and the memory utilization efficiency Can be improved.

  In the communication terminal according to the present invention, the synchronization unit synchronizes the processing result file with the mail server and reflects the processing result file when the processing result file is reflected in the mail server. It is characterized by that.

  In the present invention, when the processing content described in the processing result file is reflected to the mail server, the processing result file is not left unnecessarily by deleting the processing result file, and the subsequent processing is simplified. Can be.

  According to the present invention, it is possible to reduce the processing load caused by performing synchronization processing. Furthermore, since the processing result is described in the file name, the processing result can be read without opening the file, and the processing can be performed quickly.

It is a system configuration figure showing a communication system using communication terminal 100 of this embodiment. It is a block diagram which shows the function structure of the communication terminal 100 of this embodiment. 2 is a hardware configuration diagram of a communication terminal 100. FIG. It is explanatory drawing which shows the file structure which consists of a directory entry and an i-node data structure. 2 is a block diagram showing a functional configuration of a mail server 200. FIG. 3 is a flowchart showing processing of the communication terminal 100.

  Embodiments of the present invention will be described with reference to the accompanying drawings. Where possible, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a system configuration diagram showing a communication system using the communication terminal 100 of the present embodiment. This communication system includes a communication terminal 100 (100a to 100c) and a mail server 200. The communication terminal 100 can acquire and display e-mail data including a mail text held in the mail server 200. In addition, the communication terminal 100 stores the mail text of the new e-mail data, e-mail data instructed to be explicitly acquired, and e-mail data instructed to be explicitly retained among e-mail data. Hold. On the other hand, header information / bibliographic information such as a destination, a subject, or a reception date / time is retained without an explicit instruction from the user, and when the retained number exceeds the upper limit, it is deleted in the oldest order.

  The mail server 200 includes a mail box 207. This mail server 200 is a so-called cloud server, and is a mail server that can be accessed from a plurality of communication terminals 100 with the same account. Even if the mail server 200 distributes the e-mail data to the communication terminal 100, the mail server 200 does not delete the e-mail data and keeps it until there is an explicit deletion instruction from the user.

  In FIG. 1, communication terminals 100a to 100c are shown. In the present embodiment, the same user owns the communication terminals 100 a to 100 c, and the communication terminals 100 a to 100 c have the same account with respect to the mail server 200. For example, the communication terminal 100a is a mobile phone, the communication terminal 100b is a personal computer at home, and the communication terminal 100c is a tablet terminal.

  In such an environment, the user can acquire and browse the same electronic mail data from the mail server 200 by operating each communication terminal 100.

  FIG. 2 is a block diagram illustrating a functional configuration of the communication terminal 100 according to the present embodiment. As shown in FIG. 2, the communication terminal 100 includes an operation control unit 101 (operation unit), a data processing unit 102 (process execution unit), a processing result management unit 103 (file generation unit), and a mail box 104 (data storage unit). ), A processing result file storage unit 105 (processing result storage unit), a mail list display control unit 106, a mail detail display control unit 107, a communication unit 108 (synchronization unit), and a display unit 109.

  FIG. 3 is a hardware configuration diagram of the communication terminal 100. As shown in FIG. 3, the communication terminal 100 shown in FIG. 1 physically includes a CPU 11, a RAM 12 and a ROM 13 that are main storage devices, an input device 14 such as a keyboard and a mouse that are input devices, and an output such as a display. The computer system includes a device 15, a communication module 16 that is a data transmission / reception device such as a network card, and a flash memory 17 that is a nonvolatile rewritable semiconductor memory. Each function in FIG. 2 operates the input device 14, the output device 15, and the communication module 16 under the control of the CPU 11 by reading predetermined computer software on the hardware such as the CPU 11 and the RAM 12 shown in FIG. 3. In addition, it is realized by reading and writing data in the RAM 12 and the flash memory 17. Hereinafter, each functional block will be described based on the functional blocks shown in FIG.

  The operation control unit 101 is a part that receives an operation from the user. For example, the user can perform operations such as deleting e-mail data, moving e-mail data between folders, or renaming a folder.

  The data processing unit 102 is a part that executes processing based on an operation performed by the operation control unit 101. For example, if the e-mail data is to be deleted, a process for deleting the corresponding e-mail data from the mail box 104 is performed. Similarly, the name change of the folder and the movement of the e-mail data between the folders are executed based on the instruction. In addition, the data processing unit 102 performs processing for creating, editing, and transmitting / receiving e-mail data.

  The processing result management unit 103 is a part that creates a processing result file from the processing result processed by the data processing unit 102 and stores the created processing result file in the processing result file storage unit 105. Specifically, the processing result management unit 103 generates a character string indicating a mail ID, a CUE number, a type, a status before change, and a status after change as information for specifying a processing result, and synthesizes these character strings. To generate a series of character strings. Then, a processing result file with the character string as the file name is generated. Here, the mail ID is an ID that uniquely identifies the e-mail data. The CUE number is an ID that uniquely identifies the process. The type is information indicating whether the processing target is a folder or e-mail data. The status before change is information indicating a status before the processing for the e-mail data or the folder is performed. The post-change status is information indicating the status changed by the process. Further, the processing result management unit 103 generates a character string indicating a mail ID, a CUE number, a type, a status before change, and user operation information as information for specifying a processing result as a file name. The processing result file may be generated.

  Here, the status before change and the status after change are as follows: for e-mail data, belonging folder ID, read / not read, necessity of protection, presence / absence of reply, presence / absence of transfer, necessity / non-return of reply It consists of numerical information indicating. In addition, for a folder, it consists of numerical information indicating the presence or absence of new creation, the presence or absence of a name change, and the presence or absence of deletion. For example, mail ID: 10001, CUE number: 15001, type: M (indicating email data), affiliation folder ID: 101, read status: unread, protection status: unprotected, reply status: unanswered, transfer status: Untransferred, reply required status: reply required, erased: none is expressed as 101000000 as the status before change. On the other hand, if the status is changed to read status: read, protection status: protection by a user operation, the post-change status is expressed as 101110000. Then, 10001 + 15001 + M + 1101000000 + 101000110 obtained by synthesizing these character strings is described in the processing result file as a file name. In addition, although “+” is added between the items for convenience, it is added for convenience, but “+” may be omitted. In the above item, 0 is described as numerical information such as unread or unprotected, but 1 is described in the case of already read or protected. Here, for convenience, the mail ID is indicated by a five-digit number, but is not limited to this.

  On the other hand, when the user operation information is used for the file name of the processing result file, the character string of the user operation information is used instead of the above-mentioned changed status. For example, in the above-described case, the character string of the user operation information is a process of changing the read state: read to the protected state: changing to the protection. Expressing, expressing that the reply state / forwarding state / required reply state is not operated by 2 and not deleting is expressed by 0, the character string indicating the user operation information is 101112220 together with the folder information. The file name of the result file is 10001 + 15001 + M + 101000000 + 101112220.

  Then, the processing result management unit 103 can create and hold a processing result file having the above file name and without actual data in the processing result file storage unit 105 provided on the flash memory 17. Here, the processing result file is described only in the file name area in the directory entry and does not accompany the actual data, so that the block of the flash memory 17 is not consumed. The file management structure and the file name structure will be described with reference to FIG. FIG. 4 is an explanatory diagram showing a file structure comprising a directory entry and an i-node data structure. This explanatory diagram generally shows a file structure in UNIX (registered trademark) or the like.

  As shown in FIG. 4, the directory entry has a data structure including an i-node number and a file name. The i-node data structure includes a file classification (directory or file classification), an i-node number, a user ID, a file size, and the like. The processing result management unit 103 can describe a character string indicating the processing result in the file name area of the directory entry.

  Further, the structure of the file name will be described with reference to FIG. 4 using an example of a processing result file in a format that holds both the status before change and the status after change. As described above, the file name in this case consists of a character string indicating the mail ID, CUE number, type, status before change, and status after change. Further, the pre-change status and post-change status include numerical information indicating the affiliation folder ID, presence / absence of read, necessity of protection, presence / absence of reply, presence / absence of transfer, necessity / non-necessity of reply, and presence / absence of deletion. In FIG. 4, 10001 + 15001 + M + 1101000000 + 101000110 is generated as a file name and described in the directory entry area. In FIG. 4, the pre-change status has been described as an example. However, as described above, even when user operation information is included in the file name, the same data structure is assumed.

  Furthermore, the processing result management unit 103 manages the number of created processing result files. When the number of processing result files reaches a predetermined number, the processing result file is sent to the mail server 200 via the communication unit 108. Requests the server to process the name described. In the mail server 200, when the processing based on the request is successful, the processing result management unit 103 deletes the processing result file that has been successfully processed from the processing result file storage unit 105. In the mail server 200, when there is no notification that the process is successful, a retry process is performed after a predetermined time. Note that the state of the e-mail data in the mail server 200 may be rewritten by forcibly synchronizing or the process for restoring the e-mail data in the communication terminal 100 may be performed.

  In addition to the above, the processing result management unit 103 determines whether there is an explicit synchronization operation by the user, a communication connection with the mail server, or a predetermined time after synchronization. When at least one of these conditions is satisfied, an instruction is output to the communication unit 108 to perform the synchronization process.

  The mail box 104 is a part that stores electronic mail data acquired from the mail server 200. This mailbox stores e-mail data that is distinguished for each folder. Among the folders, the inbox contains header information such as the sender, subject, e-mail size, received date and time, e-mail data body, and An attached file is stored, and in the sent box, header information such as a destination, a subject, a mail size, a reception date and time, an e-mail data body, and an attached file are stored. In the present embodiment, the information is not limited to such information, and header information such as various flags and status information may be included in the email data and stored. In addition, by the control of the data processing unit 102, the e-mail data body and attached files in the mailbox 104 are automatically deleted from the old unprotected items in chronological order from the viewpoint of efficiently using the memory capacity. The

  The processing result file storage unit 105 is provided on the flash memory 17 and stores the processing result file created by the processing result management unit 103. The processing result file storage unit 105 stores a plurality of processing result files each time it is created. However, since the processing result file is described only in the file name area in the directory entry, the memory amount used by the processing result file storage unit 105 is extremely small.

  The mail list display control unit 106 reads out the header information / bibliographic information of the e-mail data in the folder designated by the user from the mailbox 104, the header information / bibliographic information of the folder, and the e-mail data or the header part of the folder This is the part that displays a list of some of

  The mail detail display control unit 107 is a part that reads and displays the mail text and attached file in the email data from the mail box 104. Here, the mail detail display control unit 107 performs request processing on the mail server 200 via the communication unit 108 when the mail body and the attached file of the designated e-mail data are not stored in the mail box 104. I do. When the reading process is performed, various status information such as the read status corresponding to the electronic mail data managed in the mail box 104 is rewritten.

  The communication unit 108 is a part that performs communication connection with the mail server 200 using a predetermined protocol, and is a part that performs transmission / reception processing of electronic mail. Further, the communication unit 108 requests various processes from the mail server 200 and receives the processing results. The communication unit 108 performs a synchronization process with the mail server 200 based on an instruction from the processing result management unit 103. The synchronization processing here is processing for matching the e-mail data stored in the mail box 104 and its management information with the e-mail data and its management information in the mail server 200.

  The display unit 109 is a part that displays a mail list and e-mail data based on display control by the mail list display control unit 106 and the mail detail display control unit 107.

  Next, the mail server 200 will be described. FIG. 5 is a block diagram showing a functional configuration of the mail server 200. This mail server 200 also has a hardware configuration as shown in FIG. 3, and executes processing based on programs stored in the RAM, ROM, and auxiliary storage device.

  The communication unit 201 is a part for performing communication with the communication terminal 100 and other external mail servers, and transmission / reception of mail with the external mail server, transmission / reception of mail with the communication terminal 100, and synchronization. It is a part which performs the communication process for a process.

  The mail receiving unit 202 is a part for registering e-mail data received through the communication unit 201 in the mail box 207 through the data management unit 206.

  The mail transmission unit 203 is a part that transmits electronic mail data received from the communication terminal 100 to an external mail server via the communication unit 201. The mail transmission unit 203 registers the transmitted e-mail data in the mail box 207 via the data management unit 206.

  The process accepting unit 204 is a part that accepts various processing requests (for example, synchronization processing) received from the communication terminal 100 and instructs the data processing unit 205 to execute the various processes. When the data processing unit 205 fails to execute the process, the communication unit 201 notifies the fact.

  The data processing unit 205 is a part that executes each process for the e-mail data and the folder instructed by the process receiving unit 204. Specifically, processes such as deletion of e-mail data, movement of e-mail data across folders, and change of folder name are executed. The executed process is notified to the process reception unit 204.

  The data management unit 206 stores the e-mail data in the mail box 207 based on instructions from the mail receiving unit 202, the mail transmitting unit 203, and the data processing unit 205, and changes the e-mail data and the folder. It is a part which performs etc.

  The mail box 207 is a part for storing e-mail data and folder structure for each mail account.

  Next, operations of the communication terminal 100 and the mail server 200 configured as described above will be described. FIG. 6 is a flowchart showing processing of the communication terminal 100. In FIG. 6, first, a mail list display screen is displayed on the display unit 109 according to the control of the mail list display control unit 106 according to the user operation (S101). Then, the user operates the operation control unit 101 while viewing the mail list display screen, thereby instructing processing for the e-mail data or the folder (S102). When the data processing unit 102 receives the operation instruction (for example, deletion of e-mail data or name change of a folder), the data processing unit 102 performs change processing on the corresponding e-mail data stored in the mail box 104 or the folder ( S103). The processing result management unit 103 creates a processing result file having a file name based on the processing result processed by the data processing unit 102, and the processing result file storage unit 105 stores the processing result file (S104).

  Here, the data processing unit 102 determines whether or not the predetermined condition is satisfied in the communication terminal 100 (S105). Here, for example, whether or not the number of processing result files exceeds a predetermined number, whether or not an explicit operation has been performed, whether or not mail transmission / reception has been performed (that is, whether or not connected to the mail server 200), It is determined whether or not a certain time has elapsed since the last synchronization process was performed. Here, if it is determined that the predetermined condition is satisfied, the communication unit 108 requests the mail server 200 for processing corresponding to the file name of the processing result file having the smallest CUE number (S106).

  Here, in the mail server 200, it is determined whether or not the processing for the request has been successful (S107). If it is determined that the processing has been successful, the data processing unit 102 indicates the processing reflected in the mail server 200. The processing result file is deleted (S108). Then, it is determined whether or not the processing result file remains (S110). If the processing result file remains, the process returns to S106 and the next processing result file is processed (S106).

  If the mail server 200 is not successfully processed, error processing is performed by the data processing unit 102 (S109). The error processing here is, for example, retry processing or forced synchronization processing (such as copying information in the communication terminal 100 as it is). These processes are repeated.

  Below, the effect in the communication terminal 100 in this embodiment is demonstrated. In the communication terminal 100 according to the present embodiment, the data processing unit 102 executes the process accepted by the operation control unit 101, and the process result management unit 103 files a character string based on the process result of the accepted operation. Generate a processing result file with a name. Then, the processing result file storage unit 105 stores the generated processing result file, and the processing result management unit 103 reads the processing result from the file name of the stored processing result file at a predetermined timing. The communication unit 108 executes a synchronization process with the mail server that stores the electronic mail data according to the processing result. As a result, the processing load due to the synchronous processing can be reduced, and the processing result is described in the file name, so that the processing result can be read without opening the file, and the processing can be performed quickly. It can be carried out.

  The predetermined timing here is when an explicit synchronization operation is performed by the user, when a certain number of processing result files are stored in the processing result file storage unit 105, or when the communication connection with the mail server 200 is established. Or, when a predetermined time elapses after the communication unit 108 synchronizes, at least one can be considered. It should be noted that the predetermined timing is particularly effective when a certain number of processing result files are created. If synchronization processing is performed each time a processing result file is created, the processing load on the mail server 200 increases. That is, generally, there are tens of millions of communication terminals 100. Therefore, when synchronization processing is performed each time the communication terminal 100 creates a processing result file for the mail server 200, processing in the mail server 200 is performed. The load increases. Therefore, the processing load on the mail server 200 can be reduced by performing the synchronization processing when the number of processing result files reaches a certain number. The same effect can be obtained by performing the synchronization process when a certain time has elapsed.

  In addition, the file name of the processing result file created by the processing result management unit 103 includes the status before the change and the status after the change. Processing can be performed. For example, the name of the folder before the change may be included as the status before the change, and the name of the folder after the change may be included as the status after the change.

  Further, the file name of the processing result file created by the processing result management unit 103 includes the status before the change and the operation information of the user, so that the state before and after that can be made clear and accurate Can be processed. For example, the status before the change may include information on the name of the folder before the change and what operation has been performed on the name.

  In addition, the processing result file includes a type indicating the operation target, so that an accurate process for the operation target can be performed. The type here indicates whether the operation is for email data or a folder.

  In addition, since the processing result file does not include entity data, the file size can be extremely reduced, and the memory utilization efficiency can be improved. As described above, by using only the directory entry area in the i-node corresponding to the management information, in the case of a general file including a file having a data structure by the i-node, if nothing is described in the entity data, The file size can be reduced as much as possible.

  In addition, the processing result management unit 103 performs synchronization processing for each processing result file through the communication unit 108 and deletes the processing result file when the processing content described in the processing result file is reflected on the mail server. Thus, the processing result file is not left unnecessarily, and the subsequent processing can be simplified.

DESCRIPTION OF SYMBOLS 101 ... Operation control part, 102 ... Data processing part, 103 ... Processing result management part, 104 ... Mail box, 105 ... Processing result file storage part, 106 ... Mail list display control part, 107 ... Mail detailed display control part, 108 ... Communication unit 109 ... Display unit 200 ... Mail server 201 ... Communication unit 202 ... Mail reception unit 203 ... Mail transmission unit 204 ... Process reception unit 205 ... Data processing unit 206 ... Data management unit 207 ... Mailbox.

In order to solve the above-described problem, a communication terminal according to the present invention includes a data storage unit that stores email data by distinguishing each folder, and an operation unit that receives an operation on the email data or the folder stored in the data storage unit. A process execution unit that executes a process according to the operation received by the operation unit, and a file that generates a process result file with a character string based on the process result of the operation received by the operation unit as a file name A processing result storage means for storing the processing result file generated by the file generation means, and a processing result from the file name of the processing result file stored in the processing result storage means at a predetermined timing. read, write of storing electronic mail data read processing result Send to over server, and a, and synchronization means for synchronizing between the mail server.

Further, the synchronization method of the present invention is an operation for accepting an operation on the e-mail data or the folder stored in the data storage means in the synchronization method in the communication terminal including the data storage means for distinguishing and storing the e-mail data for each folder. Generating a processing result file having a file name as a character string based on a processing result of the step, a processing execution step for executing processing according to the operation received by the operation step, and a processing result of the operation received by the operation step A file generation step, a storage step of storing the processing result file generated by the file generation step in the processing result storage unit, and a file name of the processing result file stored in the processing result storage unit at a predetermined timing Read processing result from , The read processing result, and transmitted to the mail server that stores electronic mail data, and a synchronization step for synchronizing between the mail server.

Claims (8)

Data storage means for storing e-mail data separately for each folder;
Operation means for accepting an operation on the e-mail data or folder stored in the data storage means;
Processing execution means for executing processing according to the operation received by the operation means;
A file generation unit that generates a processing result file with a character string based on an operation received by the operation unit as a file name;
Processing result storage means for storing the processing result file generated by the file generation means;
A synchronization unit that reads a processing result from a file name of a processing result file stored in the processing result storage unit at a predetermined timing, and synchronizes with a mail server that stores e-mail data;
A communication terminal comprising:   2. The communication according to claim 1, wherein the file generation unit generates a processing result file having a file name as a character string based on a status before change and user operation information in e-mail data or a folder. Terminal.   2. The communication terminal according to claim 1, wherein the file generation unit generates a processing result file with the status before change and the status after change in the e-mail data or folder as file names. The synchronization means has a predetermined timing as follows:
When an explicit synchronization operation is performed by the user,
When a certain number of processing result files are stored in the processing result storage means,
When communicating with the mail server,
Or, when a predetermined time has elapsed since the synchronization means synchronized,
The communication terminal according to claim 1, wherein synchronization processing is performed when at least one of the above conditions is satisfied.
  The communication terminal according to any one of claims 1 to 4, wherein the file generation unit generates a processing result file including a type indicating an operation target among e-mail data or a folder.   The communication terminal according to claim 1, wherein the file generation unit generates a processing result file that does not include entity data.   The synchronization unit synchronizes each processing result file with respect to the mail server and, when reflected in the mail server, deletes the reflected processing result file. The communication terminal according to any one of 6. In a synchronization method in a communication terminal comprising data storage means for storing e-mail data separately for each folder,
An operation step of accepting an operation on the e-mail data or folder stored in the data storage means;
A process execution step for executing a process according to the operation received by the operation step;
A file generation step of generating a processing result file having a character string based on the processing result of the operation received by the operation step as a file name;
A storage step of storing the processing result file generated by the file generation step in a processing result storage unit;
A synchronization step of reading a processing result from the file name of the processing result file stored in the processing result storage means at a predetermined timing and synchronizing with a mail server storing e-mail data;
A synchronization method comprising:

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