JP5480935B2 - Mobile terminal and e-mail management method - Google Patents

Description

  The present invention relates to a mobile terminal that receives an electronic mail and an electronic mail management method in the mobile terminal.

  Conventionally, when an e-mail is received by a mobile terminal such as a mobile phone, all data of the received e-mail is held in the mobile terminal. On the other hand, in recent years, since one user uses a plurality of mobile terminals such as mobile phones and tablet terminals, for example, all received e-mails are sent to the server side instead of the mobile terminal side. It is conceivable to configure the communication system so as to hold it. In the communication system configured as described above, each mobile terminal can synchronize e-mail data between the server and the mobile terminal, and the mobile terminal can acquire some or all e-mail data. .

  Here, generally, the storage capacity of the memory mounted on the portable terminal is small. For this reason, it is unrealistic to hold all received e-mails including the mail data including the text and attached files in the portable terminal because the necessary storage capacity becomes very large. On the other hand, if the entire e-mail is deleted from the mobile terminal, the mobile terminal side needs to acquire the e-mail from the server again when performing an operation on the deleted e-mail. Inconvenient. In particular, when the mobile terminal is out of the communication range, it is impossible to obtain an e-mail from the server, and an operation on the e-mail becomes impossible.

  Under such a background, for example, in the technique described in the following cited document 1, for the email cached locally in the wireless information device, the email manager program leaves the email header information, and at least the text By deleting one of the attachments, you can reduce the memory consumption of the wireless information device, move between email folders and create email replies, even when not connected to the server, email Operations such as sorting emails and deleting emails.

JP-T-2004-536507

  In a communication system that holds an e-mail on the server side as described above, when referring to the e-mail mail data deleted on the mobile terminal side again on the mobile terminal side, the mail data can be acquired again from the server. I need it. For this reason, it is preferable not to delete mail data for an electronic mail that is highly likely to be referred to. However, in the technique described in the above cited reference 1, an email is selected from locally cached emails based on a certain rule, and the email data of the selected email is deleted. . For this reason, the mail data is deleted even for an electronic mail that is highly likely to be referred to.

  Therefore, the present invention provides a portable terminal capable of preventing email data that is highly likely to be referenced from being deleted from the portable terminal while suppressing the storage capacity required to hold the email. And an e-mail management method.

In order to solve the above-described problems, a mobile terminal according to the present invention includes a receiving unit that receives an e-mail including a header and mail data, and an electronic that does not satisfy a predetermined condition among e-mails received by the receiving unit. For email, the email is stored in a non-volatile state that does not erase the email data, and the email that satisfies the predetermined condition and the designated operation to be deleted are accepted by the delete operation acceptance means For e-mail, storage means for storing the e-mail in a cache state in which the e-mail data of the e-mail is erased at a predetermined timing, and e-mail satisfying a predetermined condition among e-mails stored in the storage means On the other hand, an erasing unit that erases only the mail data of the e-mail at a predetermined timing is provided.

The e-mail management method of the present invention is an e-mail management method in a portable terminal, and includes a receiving step for receiving an e-mail composed of a header and mail data, and a deletion for accepting an operation for specifying an e-mail to be deleted. Among the emails received in the operation accepting step and the receiving step, for emails that do not satisfy the predetermined condition, the email is stored in a nonvolatile state that does not erase the email data of the email, With respect to an e-mail that satisfies the predetermined condition and an e-mail that has received a designation operation to be deleted by the deletion operation receiving step, the electronic mail is stored in a cache state in which the mail data of the e-mail is deleted at a predetermined timing. a storage step of storing the email, stored in the storage step Provided for a given condition is satisfied email of email, and erasing step of erasing only the mail data of the electronic mail at a predetermined timing, the.

  According to these inventions, the received electronic mail is stored, and only the mail data of the electronic mail that satisfies the predetermined condition among the stored electronic mails is deleted. Accordingly, the storage capacity for storing the mail data of the e-mail that satisfies the predetermined condition is reduced, so that the storage capacity necessary for holding the e-mail can be suppressed. Further, by removing the email data that is highly likely to be referenced from the target of deleting the email data, it is possible to prevent the email data of the email from being deleted from the portable terminal.

  According to this invention, the storage means stores an email that satisfies a predetermined condition in a cache state, the erasure means deletes the mail data at a predetermined timing, and the storage means stores an email that does not satisfy the predetermined condition. The data is stored in a nonvolatile state, and the erasing unit does not erase the mail data of the electronic mail. Therefore, it is possible to reduce the storage capacity for storing e-mail data of e-mails that satisfy a predetermined condition, and to suppress the storage capacity necessary for holding e-mails. In addition, since an e-mail that is highly likely to be referenced can be stored in a non-volatile state, it is possible to prevent the e-mail data of the e-mail from being deleted from the portable terminal.

  Further, in the portable terminal of the present invention, the storage means is configured to change the storage state from the nonvolatile state to the cache state for an email whose number of stored emails exceeds a predetermined threshold. You may make a transition to.

  According to this invention, since the storage means shifts the number of e-mails exceeding the predetermined threshold value from the non-volatile state to the cache state, the number of e-mails stored in the non-volatile state is suppressed to a predetermined threshold value or less. And the storage capacity necessary to hold the e-mail can be reduced.

  In the portable terminal of the present invention, the storage means selects an e-mail with the oldest reception date from e-mails stored in a non-volatile state, and changes the storage state from the non-volatile state to the cache state. You may let them.

  According to this invention, since the storage means selects the e-mail with the oldest reception date and changes the storage state to the cache state, the mail data of the new e-mail with the reception date and time that is likely to be referenced Can be prevented from being erased from the portable terminal.

  The portable terminal of the present invention further includes a protection operation accepting unit that accepts an operation for designating an e-mail to be protected, and the storage unit accepts an e-mail for which the designated operation to be protected is accepted by the protection operation accepting unit. Thus, even if the predetermined condition is satisfied, it may be stored in a nonvolatile state.

  According to this invention, since the protection operation accepting unit accepts the designated operation and the e-mail targeted for protection continues to be stored in a non-volatile state even when a predetermined condition is satisfied, it is highly likely to be referenced. By designating an e-mail as a protection target, it is possible to prevent an e-mail that has a high possibility of being referred to from being changed to a cache state and subsequently deleting the e-mail data of the e-mail.

According to this invention, since the e-mail targeted for deletion by the deletion operation accepting unit accepting the designation operation is stored in a cache state, the user of the mobile terminal wants to refer to the e-mail targeted for deletion again. In this case, it is possible to make the user refer to the e-mail data without acquiring the e-mail data from the server again. In the mobile terminal of the present invention, the storage means stores the header of the electronic mail in a nonvolatile state for the electronic mail for which the designation operation to be deleted is received by the deletion operation reception means.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that the mail data of mail with high possibility of being referred to are deleted from a portable terminal.

It is a figure which shows the structure of the communication system which concerns on this embodiment. It is a figure which shows the function structure of the portable terminal which concerns on this embodiment. It is a figure which shows the hardware constitutions of the portable terminal which concerns on this embodiment. It is a state transition diagram which shows the method of the management of the email in the portable terminal which concerns on this embodiment. It is a flowchart which shows the acquisition process of the email in the portable terminal which concerns on this embodiment. It is a flowchart which shows the movement process of the email from the non-volatile storage part in the portable terminal which concerns on this embodiment. It is a figure which shows typically how to memorize | store the email in the portable terminal which concerns on this embodiment.

  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 diagram illustrating a system configuration of a communication system according to the present embodiment. This communication system includes a mobile phone 10 (mobile terminal), a tablet terminal 30 and a mail server 50. Each of the mobile phone 10 and the tablet terminal 30 is communicatively connected to the mail server 50 via a communication network such as a mobile phone network. The mobile phone 10 and the tablet terminal 30 are used by the same user. The mail server 50 stores all e-mail data received by the users of the mobile phone 10 and the tablet terminal 30. Then, the mobile phone 10 and the tablet terminal 30 receive e-mail data from the mail server 50 via the communication network in accordance with a user operation, and store the received e-mail data as described below.

  FIG. 2 is a diagram illustrating a functional configuration of the mobile phone 10. The mobile phone 10 includes a reception unit 11 (reception unit), a nonvolatile storage unit 12 (storage unit), a control unit 13, a cache storage unit 14 (storage unit), a protection operation reception unit 15 (protection operation reception unit), and a deletion operation reception. The unit 16 (deleting operation accepting unit) and the erasing unit 17 (erasing unit) are included. Each of these functions is implemented and configured by hardware such as a CPU, RAM, and ROM shown in FIG.

  FIG. 3 is a hardware configuration diagram of the mobile phone 10. As shown in FIG. 2, the cellular phone 10 shown in FIG. 2 physically includes a CPU 1, a RAM 2 and a ROM 3 that are main storage devices, an input device 4 such as operation keys that are input devices, and an output device such as a display. 5. A computer system including a communication module 6 that is a data transmission / reception device such as a network card, an auxiliary storage device 7 such as a semiconductor memory, and the like. Each function described in FIG. 1 has the input device 4, the output device 5, and the communication module 6 under the control of the CPU 1 by reading predetermined computer software on the hardware such as the CPU 1 and the RAM 2 shown in FIG. This is realized by reading and writing data in the RAM 2 and the auxiliary storage device 7. The tablet terminal 30 has the same hardware configuration. Hereinafter, each functional block of the communication destination terminal device 10 will be described based on the functional blocks shown in FIG.

  The receiving unit 11 receives an e-mail composed of a header and mail data. The header is, for example, a part including source information, destination, subject, transmission date and time. In the present embodiment, the mail data is a part other than the header in the electronic mail, and includes, for example, a text, an attached file, and the like. The body is a part including a text message. It should be noted that the mail data of the e-mail only needs to include at least one of a body text and an attached file.

  The nonvolatile storage unit 12, the control unit 13, and the cache storage unit 14 function as a storage unit that stores the electronic mail received by the reception unit 11. The non-volatile storage unit 12 stores headers of all received e-mails and mail data of some e-mails. The non-volatile storage unit 12 is different from the cache storage unit 14 described below in that the e-mail is in a non-volatile state in which the e-mail mail data is not deleted regardless of a predetermined timing at which the cache storage unit 14 deletes the e-mail mail data. Remember. That is, the non-volatile storage unit 12 stores the e-mail header and e-mail data even when the e-mail application program used for browsing, sending / receiving, deleting, moving folders, etc. of the e-mail in the mobile phone 10 is terminated. Become. In addition, the nonvolatile storage unit 12 stores the email header and the mail data even when the power of the mobile phone 10 is cut off due to a shortage of the remaining battery power of the mobile phone 10. Such a function of the nonvolatile storage unit 12 can be realized by using, as hardware, a nonvolatile memory such as a flash memory in which information is not lost when power supply is cut off. The maximum number of emails (threshold value) that can be stored in the nonvolatile storage unit 12 is set in advance by the user of the mobile phone 10.

  The cache storage unit 14 stores mail data of some e-mails among e-mails received by the receiving unit 11. The cache storage unit 14 stores the email in a cache state in which the email data of the email is deleted at a predetermined timing. The predetermined timing is, for example, when the e-mail application program is terminated in the mobile phone 10. Further, the cache storage unit 14 may delete the mail data of the e-mail when the remaining battery level for driving the mobile phone 10 is insufficient and the power is shut off. The function of the cache storage unit 14 can be realized as hardware using a volatile memory such as a DRAM that loses information when the power supply is cut off.

  The control unit 13 moves the e-mail data stored in the nonvolatile storage unit 12 to the cache storage unit 14 when a predetermined condition described later is satisfied.

  The protection operation accepting unit 15 accepts a designation operation for designating an electronic mail that the user wants to protect via the input device 4. When the protection operation reception unit 15 receives the designation operation, the control unit 13 starts control so that the mail data of the email designated as the protection target is not moved from the nonvolatile storage unit 12. At this time, when the mail data of the e-mail to be protected is stored in the cache storage unit 14, the e-mail mail data is moved to the nonvolatile storage unit 12. Further, when the mail data of the e-mail to be protected is not stored in either the nonvolatile storage unit 12 or the cache storage unit 14, the e-mail data of the e-mail is acquired by the receiving unit 11. The stored mail data is stored in the nonvolatile storage unit 12.

  The delete operation accepting unit 16 accepts a designation operation for designating an e-mail that the user wants to delete via the input device 4. When the deletion operation accepting unit 16 accepts the designation operation, the control unit 13 moves the mail data of the electronic mail designated as the deletion target from the nonvolatile storage unit 12 to the cache storage unit 14.

  The erasure unit 17 erases e-mail data stored in the cache storage unit 14 at a predetermined timing. The predetermined timing is, for example, when the electronic mail application program is terminated, when the power of the mobile phone 10 is shut off, or the like.

  Next, an e-mail management method in the mobile phone 10 of the present embodiment will be described.

  FIG. 4 is a state transition diagram showing transition of the management state of e-mail in the mobile phone 10. The nonvolatile storage unit 12 and the cache storage unit 14 store each electronic mail received by the mobile phone 10 as one of the following three storage states. The first state St1 is a non-volatile state in which both e-mail data and headers are stored in the non-volatile storage unit 12. The second state St2 is a cache state where the header of the email is stored in the non-volatile storage unit 12 and the mail data of the email is stored in the cache storage unit 14. The third state St3 is an erased state in which the e-mail header is only stored in the non-volatile storage unit 12 and the mail data is not stored in either the non-volatile storage unit 12 or the cache storage unit 14. In any of the first to third states St1 to St3, the e-mail header is stored in the non-volatile storage unit 12 and deleted from the non-volatile storage unit 12 or moved from the non-volatile storage unit 12 to the cache storage unit 14. There is nothing to do.

  A mode of transition of the storage state of the e-mail between the first to third states St1 to St3 will be described. First, when the receiving unit 11 receives an e-mail from the mail server 50, both the header and the mail data are stored in the non-volatile storage unit 12. That is, when an e-mail is received, the storage state of the e-mail is in a state St1 immediately after reception.

  Next, the user performs an operation for designating an e-mail that the user wants to delete for the e-mail in the state St1. This operation is, for example, that the user moves the e-mail to the trash folder in the e-mail application program. At this time, the deletion operation reception unit 16 receives a user operation. Then, the control unit 13 moves the mail data of the electronic mail from the nonvolatile storage unit 12 to the cache storage unit 14. That is, the storage state of the e-mail transitions from the state St1 to the state St2. In addition, as described later, when the pushing process is performed on the e-mail, the storage state of the e-mail similarly changes from the state St1 to the state St2. The condition for performing the push-out process is that the number of e-mails in which the mail data is stored in the non-volatile storage unit 12 exceeds the predetermined maximum storage number, and the e-mail to be subjected to the push-out process is in an unprotected state. Yes, and the transmission date / time is old.

  When the protection operation accepting unit 15 accepts a protection operation for an email in the state St2, that is, an email whose email data is stored in the cache storage unit 14, the control unit 13 stores the email data of the email in the cache storage unit. 14 to the non-volatile storage unit 12. That is, the storage state of the electronic mail changes from the state St2 to the state St1.

  When the execution of the e-mail application program in the mobile phone 10 is completed for the e-mail in the state St2, the erasure unit 17 erases the e-mail data stored in the cache storage unit 14. At this time, the non-volatile storage unit 12 does not erase the header of the e-mail and does not move it to the cache storage unit 14. That is, for the electronic mail, only the header is stored in the nonvolatile storage unit 12. This state is state St3.

  When the user performs an operation to protect the e-mail in the state St3, that is, only the header is stored in the non-volatile storage unit 12 and the e-mail does not store mail data, the receiving unit 11 re-acquires mail data of the e-mail from the mail server 50 and stores the re-acquired mail data in the nonvolatile storage unit 12. Therefore, the storage state of the e-mail transitions from St3 to St1. Further, regarding the email in the state St3, when the user views the email data of the email, the receiving unit 11 similarly acquires the email data of the email again, and the storage state of the email is St3. To St1.

  Here, of the transition process from the state St1 to the state St2, the e-mail push-out process will be described in detail with reference to FIG. FIG. 5 is a flowchart showing an e-mail acquisition process in the mobile phone 10.

  First, when the mail server 50 receives an e-mail addressed to the mobile phone 10, the mail server 50 transmits notification information called SMS-Push that notifies the mobile phone 10 that the e-mail has been received. When the mobile phone 10 receives the SMS-Push, the receiving unit 11 makes an e-mail data acquisition request to the mail server 50. Then, the receiving unit 11 receives one or a plurality of electronic mails from the mail server 50 (step S1: receiving step). And the receiving part 11 memorize | stores the header and mail data of the received electronic mail in the non-volatile memory | storage part 12 (step S2: memory | storage step). Then, the control unit 13 determines whether or not the number of e-mails whose mail data is stored in the nonvolatile storage unit 12 is larger than a preset setting value (step S3). If the number of e-mails is equal to or less than the set value, the process is terminated. If the number of e-mails is larger than the set value, a movement process is performed (step S4).

  This movement process will be described with reference to FIG. First, the control unit 13 selects an e-mail with the oldest transmission date and time among non-volatile e-mails (step S11). Next, the control unit 13 determines whether or not the selected electronic mail is a protected mail in a protected state (step S12). If it is determined that the e-mail is in the protected state, the control unit 13 does not move the e-mail data of the e-mail and keeps it stored in the nonvolatile storage unit 12 (step S13). On the other hand, when the electronic mail is in the protected state in step S12, the control unit 13 confirms the content of the SMS-Push of the electronic mail and determines whether the importance of the electronic mail is high. (Step S14). The SMS-Push is notification information for notifying the mobile phone 10 that the mail server 50 has received an e-mail, and includes importance information indicating the importance of the e-mail.

  If it is determined in step S14 that the importance of the email is high, the control unit 13 keeps the email stored in the nonvolatile storage unit 12 (step S13). On the other hand, if it is determined that the importance of the email is not high, the control unit 13 moves the email data of the email from the nonvolatile storage unit 12 to the cache storage unit 14 and changes the storage state of the email. A transition is made from the nonvolatile state to the cache state (step S15).

  After step S13 or step S15, the control unit 13 determines whether or not the number of emails to be moved is zero (step S16). The number of e-mails to be moved is determined by subtracting the maximum value of e-mails that can be stored as a non-volatile state from the number of e-mails stored as a non-volatile state. If the number of e-mails to be moved is zero, the process ends. If the number of emails to be moved is not zero, the process returns to step S11 again. Note that the erasure unit 17 erases the e-mail data of the e-mail at a predetermined timing such as when the e-mail application program is terminated or when the power of the mobile phone 10 is turned off. (Erase step).

  A specific example relating to the movement process will be described with reference to FIG. Consider a case where the mobile phone 10 has already received e-mails M2 to M1000. In the following description, it is assumed that the transmission date and time of an e-mail is newer as the number attached to the e-mail is smaller. The e-mail Mn (Mn is an integer from 2 to 1000) includes a header Hn and mail data Bn. The maximum value of e-mails that can be stored as a non-volatile state is set to 500 in advance. For 500 e-mails M2 to M501 equal to the set value, mail data B2 to B501 are stored in the nonvolatile storage unit 12. For the emails M502 to M1000 whose transmission date is older than the email M501 and are not in the protected state, only the headers H502 to H1000 are stored in the nonvolatile storage unit 12, and the email data B502 to B1000 are already stored in the nonvolatile storage unit 12. And has been erased from the cache storage unit 14.

  Consider a case where an e-mail M1 composed of a header H1 and mail data B1 is newly received. At this time, the newly received electronic mail M1 is temporarily stored in the nonvolatile storage unit 12 as a nonvolatile state. For this reason, the number of e-mails stored as a non-volatile state is 501, which exceeds the set value of 500. Therefore, the control unit 13 performs a movement process. That is, the control unit 13 moves the mail data B501 of the e-mail M501 that has the oldest transmission date and time, is not a protected mail, and has a low importance to the cache storage unit 14.

  Even when the user of the mobile phone 10 performs a designation operation to designate the email M501 as a deletion target and the deletion operation reception unit 16 accepts this designation operation, the control unit 13 receives the email M1. Similarly, the mail data B501 of the e-mail M501 is moved to the cache storage unit 14.

  Further, in a state where the mail data B501 of the email M501 is stored in the cache storage unit, the user of the mobile phone 10 performs a designation operation for designating the email M501 as a protection target, and the protection operation reception unit 15 performs this designation operation. When accepted, the control unit 13 moves the mail data B501 of the email M501 from the cache storage unit 14 to the nonvolatile storage unit 12. At this time, an identifier indicating which header corresponds to which mail data is attached to the header H501 stored in the nonvolatile storage unit 12 and the mail data B501 stored in the cache storage unit 14, respectively. When the mail data B501 is moved to the non-volatile storage unit 12, the non-volatile storage unit 12 associates the header H501 with the mail data B501 based on the identifiers attached to the header H501 and the mail data B501. I do.

  Next, the operation and effect of the mobile phone 10 of the present embodiment and the e-mail management method in the mobile phone 10 will be described.

  According to the mobile phone 10 and the e-mail management method in the mobile phone 10, the non-volatile storage unit 12 stores the e-mail received by the receiving unit 11, and the erasing unit 17 satisfies a predetermined condition among the stored e-mails. Erase only email data. Accordingly, the storage capacity for storing the mail data of the e-mail that satisfies the predetermined condition is reduced, so that the storage capacity necessary for holding the e-mail can be suppressed. Further, by removing the email data that is highly likely to be referenced from the object of deleting the email data, it is possible to prevent the email data of the email from being deleted from the mobile phone 10.

  Further, according to the mobile phone 10, the cache storage unit 14 stores the mail data of the email that satisfies the predetermined condition in a cache state, the erasing unit 17 deletes the mail data at a predetermined timing, and the nonvolatile storage unit 12 Is stored in a non-volatile state, and the erasure unit 17 does not erase the e-mail data. Therefore, it is possible to reduce the storage capacity for storing e-mail data of e-mails that satisfy a predetermined condition, and to suppress the storage capacity necessary for holding e-mails. In addition, since an e-mail that is highly likely to be referenced can be stored in a non-volatile state, the e-mail data of the e-mail can be prevented from being erased from the mobile phone 10 by the erasure unit 17. .

  Further, according to the mobile phone 10, the control unit 13 causes the number of e-mails exceeding a predetermined threshold to transition from the non-volatile state to the cache state, so that mail data is stored in the non-volatile storage unit 12 in the non-volatile state. The number of e-mails can be suppressed to a predetermined threshold value or less, and the storage capacity necessary for holding e-mails can be suppressed.

  Further, according to the mobile phone 10, since the control unit 13 selects an e-mail with the oldest reception date and time and changes its storage state to the cache state, the e-mail with a new reception date and time that is likely to be referred to. Can be prevented from being deleted from the mobile phone 10.

  In addition, according to the mobile phone 10, since the protection operation receiving unit 15 receives the designation operation, the e-mail targeted for protection continues to be stored in a non-volatile state even when a predetermined condition is satisfied. By specifying a highly probable email as a protection target, it is possible to prevent an email that is highly likely to be referenced from transitioning to a cache state and subsequently deleting the email data of that email. it can.

  Further, according to the mobile phone 10, since the e-mail targeted for deletion by the deletion operation accepting unit accepting the designation operation is stored in a cache state, the user of the mobile terminal refers to the e-mail targeted for deletion again. When he / she wants to do so, he / she can refer to the e-mail data without acquiring it from the server again.

  In the mobile phone 10 according to the present embodiment, the control unit 13 has been described as moving e-mail data from the nonvolatile storage unit 12 to the cache storage unit 14. However, instead of such a configuration, the non-volatile storage unit 12 and the cache storage unit 14 are realized by using a non-volatile memory, and the control unit 13 applies the e-mail data that satisfies a predetermined condition to the mail data. The storage state of the e-mail may be managed by setting a flag indicating the cache state. In this case, when the e-mail application program is terminated, the control unit 13 deletes e-mail mail data for which a flag indicating a cache state is set, so that the same operation as in the above-described embodiment is performed. An effect is obtained.

  In the cellular phone 10 of the present embodiment, the mail data has been described as including a text and an attached file. However, the mail data may be at least one of the text and the attached file. For example, the attachment file is moved to the nonvolatile storage unit 12 or the cache storage unit 14 while the body of all the emails is stored in the nonvolatile storage unit 12, and the attached file moved to the cache storage unit 14 is transferred to the application for email It may be deleted at the end of the program. Further, for all e-mails, the text and attached files are moved to the non-volatile storage unit 12 or the cache storage unit 14 while the parts other than the text and the attached files are stored in the non-volatile storage unit 12, and are moved to the cache storage unit 14. The body text and the attached file may be deleted at the end of the e-mail application program.

  DESCRIPTION OF SYMBOLS 10 ... Mobile phone, 11 ... Receiving part, 12 ... Nonvolatile storage part, 13 ... Control part, 14 ... Cache storage part, 15 ... Protection operation reception part, 16 ... Deletion operation reception part, 17 ... Erase part

Claims (7)

A receiving means for receiving an email consisting of a header and mail data;
A delete operation accepting means for accepting an operation for specifying an e-mail to be deleted;
Among the emails received by the receiving means, for emails that do not satisfy the predetermined condition, the email is stored in a nonvolatile state that does not erase the email data of the email, and the predetermined condition is For an e-mail that has been satisfied and an e-mail that has been designated for deletion by the delete operation accepting means, the e-mail is stored in a cache state in which the e-mail data of the e-mail is erased at a predetermined timing. Storage means;
With respect to the predetermined condition is satisfied email of e-mail stored in the storage means, and erasure means for erasing only the mail data of the electronic mail at the predetermined timing,
A mobile terminal comprising: The storage means stores the header of the e-mail in a non-volatile state for the e-mail for which the designation operation to be deleted is accepted by the deletion operation acceptance means.
The mobile terminal according to claim 1. The storage means changes the storage state from a nonvolatile state to a cache state for an email in which the number of stored emails stored in a nonvolatile state exceeds a predetermined threshold. The portable terminal according to claim 1 or 2. The storage means selects an e-mail with the oldest reception date from e-mails stored in a non-volatile state, and changes the storage state from a non-volatile state to a cache state. 3. The mobile terminal according to 3. A protection operation accepting means for accepting a designation operation of an email to be protected is provided,
The storage means
For e-mail specified operation is accepted to be protected by the protective operation acceptance means, claim 1-4 also and to store in a nonvolatile state as satisfying the predetermined condition The mobile terminal according to one item. The mail data, characterized in that at least one of body or attachment, the portable terminal according to any one of claims 1-5. An e-mail management method in a mobile terminal,
A receiving step for receiving an e-mail comprising a header and mail data;
A delete operation accepting step for accepting an operation for specifying an e-mail to be deleted;
Of the emails received in the receiving step, for emails that do not satisfy the predetermined condition, the email is stored in a nonvolatile state that does not erase the email data of the email, and the predetermined condition is For an e-mail that has been satisfied and an e-mail that has been designated for deletion by the delete operation accepting step, the e-mail is stored in a cache state in which the e-mail data of the e-mail is erased at a predetermined timing. A memory step;
With respect to the predetermined condition is satisfied email of the stored e-mail in the storage step, an erasing step of erasing only the mail data of the electronic mail at the predetermined timing,
An email management method comprising:

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