JP3875250B2 - Information erasing method, mobile communication terminal device, server system, information erasing system, and program - Google Patents

Description

  The present invention relates to an information erasing method, a mobile communication terminal device, a server system, an information erasing system, and a program, and more specifically, an information erasing method for erasing information handled by a predetermined application stored in a mobile communication terminal device. The present invention relates to a mobile communication terminal device, a server system and an information erasing system using the method, and a program for realizing the method.

  Conventionally, mobile communication terminal devices such as mobile phones have been widely used. In recent mobile communication terminals, not only telephone functions but also functions such as e-mail and Internet connection are diversified, which is important not only as a personal communication tool but also as a tool to facilitate business smoothly Plays an important role.

  As described above, as a result of mobile communication terminal devices becoming indispensable as personal communication tools and business tools, personal information such as names, telephone numbers and e-mail addresses, trade secret information, etc. It is supposed to hold information that should not be easily known to others.

In addition, mobile communication terminal devices that have security functions based on passwords and fingerprint authentication have also appeared in mobile communication terminal devices so that information that is desired to be kept secret is not disclosed to others (Patent Documents 1 and 2). reference).
JP 2002-31245 A JP 2002-316651 A

  As described above, in order to protect secret information stored inside the mobile communication terminal device, mobile communication terminal devices having a security function have appeared. However, in a mobile communication terminal device that is used on a daily basis, if the security function is enabled, it takes a lot of time to operate. Therefore, it is often used with the security function disabled.

  For this reason, even if the mobile communication terminal device has a security function, if the mobile communication terminal device in which the security function is disabled is left behind, information to be kept secret is easily stolen. Even if the security function is valid, the information is held in the mobile communication terminal device, so that it may be stolen by a method such as disassembling and reading memory information. Will remain.

  The present invention has been made in view of the above circumstances, an information erasing method capable of erasing information handled by a predetermined application recorded in a mobile communication terminal device that is not at hand, and movement using the method It is an object to provide a communication terminal device, a server system, an information erasing system, and a program for realizing the method.

  The information erasure method of the present invention is an information erasure method for erasing specific information that is described in a program language that can be used universally in different execution environments and that is handled only by a predetermined application executed in a mobile communication terminal device. A method of transmitting a mail including erasure information, which is information for erasing the specific information, to the mobile terminal device; and the predetermined application is transmitted in the mail transmission step. A mail analysis determination step for receiving and analyzing the received mail and determining whether the email includes the erasure information and for deleting the specific information; a positive determination in the mail analysis determination step; In the case where the predetermined information is deleted, the predetermined application includes an information erasing step for erasing the specific information. , While the power is on at the mobile communication terminal, the predetermined application is constantly activated, an information erasing method characterized by.

  Here, “described in a programming language that can be used universally even in different execution environments” means JAVA (registered trademark) that can be used universally without depending on the execution environment of each terminal of the mobile phone. And BREW (registered trademark). Thereby, it is possible to use a predetermined application even in a terminal having a different execution environment. The predetermined application is always started when the mobile communication terminal device is powered on.

  In this information erasing method, first, in a mail transmission step, a mail including erasure information is transmitted to the mobile communication terminal device. Here, “specific information handled only by a predetermined application” means information stored / referenced only by a predetermined application. The “erase information” is information for erasing specific information included in the mobile communication terminal device, and is not limited to the text of the email, but other information included in the subject, sender, and header. Also good.

  Next, in the mail analysis determination step, the mobile communication terminal apparatus receives and analyzes the mail, and determines whether the mail includes information for deletion and is for deleting specific information. Here, it is a requirement to include information for erasure, but other requirements can be added for the determination. Subsequently, when a positive determination is made in the mail analysis determination step, the specific information is deleted in the information deletion step.

  Therefore, according to this information erasing method, it is possible to erase specific information recorded in a mobile communication terminal device that is not at hand. In addition, if the user normally uses the application, the information stored / referenced by the application is deleted, so there is no need to consciously distinguish and store the information to be deleted. As a result, it is possible to prevent erasure from being lost even if the storage is not to be performed when erasing. Further, when the mobile communication terminal device is turned on, a predetermined application is always activated, so that the mobile communication terminal device is turned on and wireless communication is possible whenever the mobile communication terminal device is turned on. The specific information can be erased by the apparatus.

  Further, in the information erasing method of the present invention, when the specific information is erased in the information erasing step, the information erasing method further includes an erasure completion reporting step for reporting that the erasure is completed via a mobile communication network. can do. In this case, the person who has received this report can confirm whether or not erasure has been performed by reporting that the erasure has been completed.

  The information erasing method of the present invention further includes an erasing request step for requesting erasing of the specific information to a server system on the network storing the erasing information, wherein the mail transmitting step includes In the server system, it can be performed when the erasure request process is performed.

  In this case, a server system composed of one or more devices is prepared on the network, and erasure information is stored in the server system. In the erasure request process, when the server system is requested to erase the specific information, the server system that has received the request performs an e-mail transmission process in which an e-mail including the erasure information is transmitted.

  Accordingly, a person who manages a mobile communication terminal device can give an instruction to erase information of the mobile communication terminal device by accessing the server system via the network, wherever it is. In addition, a person who manages a plurality of mobile communication terminal devices can manage the plurality of mobile communication terminal devices collectively by having the server system manage information for deleting each mobile communication terminal device. it can. Furthermore, if the server system cannot be accessed, the erasure information cannot be known, so that a higher security system can be constructed.

  In the information erasing method of the present invention, the erasing information can be information included in a sender address and text of the mail. In this case, since the mail analysis judgment process uses the sender's address in addition to the content of the message body, it will not be deleted by mail from another sender's address, so it will be moved to another person. It is possible to prevent the information on the communication terminal device from being deleted.

  In the information erasing method of the present invention, the mail may be a short message having a transmission / reception address as a telephone number. In this case, as compared with Internet e-mail, since it can be sent only from terminals belonging to a limited communication network, security can be further improved.

  Also, by combining the server system with an erasure request step and adding a mail source address to the erasure information, the information of the mobile communication terminal device can be erased unless the server system telephone number is used as the source address. Therefore, a higher security system can be constructed.

  In the information erasing method of the present invention, the specific information may include contact information having at least a name, a telephone number, and a mail address as information items. In this case, personal information and trade secret information can be protected by making such contact information as personal information and trade secret information to be deleted.

  The information erasing method of the present invention further includes an erasing information determining step for determining at least a part of the erasing information prior to the mail transmission step, and the erasing information determining step is performed once. , And cannot be performed until the information erasing step is completed.

  In this case, at least a part of the erasure information is determined in the erasure information determination step. This erasure information determination process is performed prior to the mail transmission process, but once performed, it cannot be performed until the information erasure process is completed. Here, “determination” means that at least a part of the erasure information is stored in the mobile communication terminal device, and at least the erasure information is stored in a device other than the mobile communication terminal device used in the mail transmission process. It shall include the meaning that a part is preserved.

  Therefore, at least a part of the erasure information can be determined for each mobile communication terminal device in which a predetermined application is installed, and even if the mobile communication terminal device is stolen or lost, the erasure information once determined Since at least a part of the information is not erased / modified, the information can be erased more reliably.

  The mobile communication terminal device of the present invention includes an erasure information recording means for recording and holding specific information handled only by a predetermined application described in a program language that can be used universally in different execution environments; A mail receiving means for receiving; a mail analysis determining means for analyzing the mail received by the mail receiving means and determining whether the mail is for deleting the specific information; affirmative in the mail analysis determining means; The information erasing means for erasing the specific information when the power is turned on, and the predetermined application is always activated when the power is on. It is a communication terminal device. Here, “written in a programming language that can be used universally in different execution environments” is used in the same meaning as in the case of the information erasing method described above.

  In this mobile communication terminal device, the erasure information recording means records and holds specific information handled by a predetermined application. Here, “specific information handled by a predetermined application” is used in the same meaning as in the information erasing method described above. The mail receiving means receives the mail, and the mail analysis determining means analyzes the mail received by the mail receiving means and determines whether the mail is for deleting specific information. The mail information analyzed here is not limited to the text of the mail, but may be other information included in the subject, sender, and header. When the mail analysis determination unit makes a positive determination, the information deletion unit deletes the specific information.

  Therefore, even when the mobile communication terminal apparatus is not at hand, the information recorded in the mobile communication terminal apparatus can be erased. In addition, when the mobile communication terminal device is turned on, a predetermined application is always started. Therefore, when the mobile communication terminal device is turned on and wireless communication is possible, the specific information is always displayed. The e-mail for erasing can be received to erase specific information.

  An information erasing system according to the present invention comprises: a mobile communication network; connected to the mobile communication network; and the mobile communication terminal device according to claim 8; connected via the mobile communication network, to the mobile communication terminal device In addition, it is written in a programming language that can be used universally in different execution environments, and includes erasure information that is information for erasing specific information handled only by a predetermined application executed on the mobile communication terminal device An information erasing system comprising: a server system that transmits mail.

  That is, this information erasing system is an information erasing system that can use the above-described information erasing method of the present invention using the above-described mobile communication terminal device of the present invention. Therefore, according to this information erasing system, it is possible to erase information recorded in a mobile communication terminal device that is not at hand.

  In the information erasure system of the present invention, the server system has a function of transmitting an email including the erasure information to each of a plurality of mobile communication terminal devices, and for each of the plurality of mobile communication terminal devices, The erasure state of the specific information can be managed. Accordingly, an administrator of a plurality of mobile communication terminal devices can collectively manage those mobile communication terminal devices.

  The program of the present invention is a program that handles specific information written in a program language that can be used universally even in different execution environments, and includes a mail reception procedure for receiving a mail; A mail analysis determination procedure for analyzing the mail and determining whether the mail is for deleting the specific information; and when the determination is positive in the mail analysis determination procedure, the specific information is deleted. Is a program for causing a processing device of a mobile communication terminal device that is turned on to always execute the information erasing procedure.

  Here, “written in a programming language that can be used universally in different execution environments” is used in the same meaning as in the case of the information erasing method described above. The “specific information” means not only information stored in advance in the mobile communication terminal device but also information stored / referenced by this program. In this program, first, mail is received in the mail reception procedure, and subsequently, in the mail analysis determination procedure, the mail received by the mail reception procedure is analyzed to determine whether the mail is for deleting specific information.

  Next, when a positive determination is made in the mail analysis determination procedure, the specific information is deleted in the information deletion procedure. Therefore, according to this program, information recorded in a mobile communication terminal device that is not at hand can be deleted. In addition, since the processing device of the communication terminal device that is turned on always executes the program, the mobile communication terminal device is turned on, and when wireless communication is possible, the specific information is always deleted. You can receive emails and delete specific information.

  As described above, according to the information erasing method, mobile communication terminal device, server system, information erasing system, and program of the present invention, it is possible to erase secret information recorded in a mobile communication terminal device that is not at hand. There is an effect.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In these drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 schematically shows a configuration of an information erasing system 100 according to an embodiment of the present invention. As shown in FIG. 1, the information erasure system 100 includes (a) a mobile phone 10, (b) a base station 41 connected to the mobile phone 10 during wireless communication, and (c) a base station 41. A connected mobile communication network 40; (d) an Internet network 45; (e) an Internet connection server 80 connecting the mobile communication network 40 and the Internet network 45; and (f) a mobile phone 10 connected to the Internet network 45. An administrator fixed terminal 60 operated by an administrator 61 of a mobile phone such as, and (g) a short message which is connected to the Internet network 45 and connected to the mobile communication network 40 and having a telephone number as an address. And a server device 70 capable of transmitting.

  Note that there are generally a plurality of base stations 41, and the mobile phone 10 may perform radio communication with different base stations, but here, it is shown as a representative one. In addition, FIG. 1 shows a user 63 of the mobile phone 10 and another mobile phone 62 that wirelessly communicates with the base station 41 that the user 63 has, although not part of the system. ing.

  FIG. 2 schematically shows an external configuration of the mobile phone 10. As shown in FIG. 2, the mobile phone 10 includes (a) an operation unit 12 having a numeric keypad for inputting a telephone number and function keys for inputting various commands such as switching of an operation mode; b) a display unit 13 having a liquid crystal display device for displaying operation guidance, operation status, received messages and the like of the mobile phone 10; and (c) a call speaker 14 for reproducing a voice signal sent from a communication partner during a call. (D) a microphone 15 for inputting sound during sound collection or for inputting sound during a call; (e) a guidance speaker 16 for generating a ringtone or guidance sound; and (f) a base. An antenna 17 for performing wireless communication with the station is provided.

  FIG. 3 schematically shows an internal system 11 that is an information processing system inside the mobile phone 10. The internal system 11 includes a control unit 21 that performs overall control of the entire system of the mobile phone 10 and a transmission / reception unit 22 that performs wireless communication with the base station via the antenna 17.

  Here, the control unit 21 has a software program unit 27 that is a program for processing by a central processing unit (CPU) (not shown). As shown in FIG. 4, the software program unit 27 is a general-purpose program written in (i) a language that can be used universally in different execution environments, so-called JAVA (registered trademark) or the like. And (ii) a basic processing unit 31 composed of a software program other than the general-purpose application unit 30.

  In addition, the basic processing unit 31 uses the display unit 13 and the communication control unit 32 that exchanges information between the general-purpose application unit 30 and the transmission / reception unit 22 when sending / receiving mails or connecting to the Internet. When performing, it has the display control part 33 which exchanges information between the general purpose application part 30 and the display part 13. FIG.

  The general-purpose application unit 30 stores and manages contact data including customer names, telephone numbers, and e-mail addresses, and stores and manages communication history data that is the contents of sent and received mails and calls. 50. Here, the phone book application 50 is an application that is always activated when the mobile phone 10 is powered on.

  The phone book application 50 (i) prompts the user to input in order to register the erasure text or the like, which is the text content of the short message for erasing the contact data and the communication history data, in the server device 70. An erasure body registration unit 51 that communicates with the server device 70, (ii) a phone book data erasure unit 52 that erases contact data and communication history data handled by the phone book application 50, and (iii) a contact. When the erasure of the destination data and the communication history data is completed, the information erasure completion reporting unit 53 that reports the completion of the erasure to the server device 70 by http communication and (iv) analyzing the received short message If the caller telephone number is the server device 70 and the text is a deletion text defined by the user, the contact data and communication history data are deleted. A message analysis / determination unit 54 that performs a determination to leave, (v) a short message communication unit 55 that controls communication of a short message, and (vi) a short message and an email that are transmitted and received are stored, and a call history is stored Communication history data section 56 and (vii) a contact data section 57 in which contact information such as customer names, telephone numbers and mail addresses are stored.

  FIG. 5 schematically shows the internal configuration of the server device 70. As shown in FIG. 5, the server device 70 includes a control unit 71 that performs overall control of the server device, a transmission / reception unit 72 that is connected to the Internet network 45 and controls communication with the Internet network 45, A transmission / reception unit 73 connected to the communication network 40 and transmitting / receiving short messages is provided.

  In addition, the control unit 71 requests (a) deletion of contact data and communication history data of mobile phones including the mobile phone 10 and manages a deletion state of whether or not deletion has been performed. 74 and (b) when the deletion of the contact data and communication history data of the mobile phone 10 is completed, a report to the effect that the deletion has been completed is received from the mobile phone 10 via the http communication, and the specified e-mail An erasure completion report receiving means 75 that requests an e-mail to be sent to an address, (c) an e-mail communication unit 76 that transmits / receives an e-mail via the transmission / reception unit 72 and the Internet network 45, and (d) a transmission / reception unit 73. And a short message communication unit 77 that transmits and receives short messages via the mobile communication network 40, and (e) contact data and communication of mobile phones such as the mobile phone 10. Erase text, which is the content of the short message text for erasing history data, email address for sending an email to that effect when an erasure completion report is made, the name of the user of the mobile phone, And an erasing text database 78 in which the phone number of the mobile phone is stored.

    Next, an information erasing method in the information erasing system 100 configured as described above will be described with reference to FIGS.

  First, as shown in FIG. 6, when the user of the mobile phone 10 starts up the phone book application 50 for the first time, the erasure text registration unit 51 of the phone book application 50 is shown in FIG. The input screen 90 is displayed on the display unit 13. Here, the user 63 inputs an erasure text that is the content of the text of the short message for erasing the contact data and the communication history data used in the telephone directory application 50 into the input box 91 to delete the data. When a completion report is made, an e-mail address for sending an e-mail to that effect is entered in the input box 92. Here, it is assumed that the e-mail address of the mobile phone 62 owned by the user 63 is input to the e-mail address.

  Next, the erasure text registration unit 51 of the phone book application 50 displays the input screen 95 on the display unit 13 as shown in FIG. 7B, and the user 63 is shown in FIG. 7A. In the same manner, the name of the user 63 is input in the input box 96 and the telephone number of the mobile phone 10 is input in the input box 97. Hereinafter, these erasure text, the e-mail address for reporting the completion of erasure, the name of the user 63, and the telephone number of the mobile phone will be referred to as “erase text, etc.”.

  When the input of these erasure texts is completed and the completion button is pressed, the erasure text registration unit 51 is notified of the erasure text etc. as shown in FIG. The erasure text registration unit 51 notifies the message analysis determination unit 54 of the erasure text or the like and stores it, and also uses the communication control unit 32, the transmission / reception unit 22, and the antenna 17 to perform the server device 70 through http communication. Send to. The transmitted information is received by the transmission / reception unit 72 of the server device 70 via the base station 41, the mobile communication network 40, the Internet connection server 80, and the Internet network 45.

  The data erasure management unit 74 of the server device 70 receives the information received from the transmission / reception unit 72 and stores the erasure text or the like as information of the mobile phone 10 in the erasure text database 78. Note that once the erasure text is registered, the input screens 90 and 95 are not displayed on the mobile phone 10, and the erasure text cannot be corrected.

  Subsequently, when the user 63 uses the telephone directory application 50, various personal information and trade secrets are stored in the communication history data unit 56 and the contact data unit 57. Thereafter, the user 63 loses the mobile phone 10, and the user 63 deletes the contact data and communication history data stored in the mobile phone 10 to the administrator of the mobile phone including the mobile phone 10. Suppose you make a request to do so.

  As shown in FIG. 8, when the manager 61 who has received a data erasure request requests a terminal information display from the administrator fixed terminal 60, the data erasure management unit 74 of the server device 70 causes the mobile phone 10 to The erasure text of the mobile phone such as the first is acquired from the erasure text database 78 and displayed on the administrator fixed terminal 60. From the displayed information, the manager 61 selects the mobile phone 10 and requests deletion of contact data and communication history data.

  Upon receipt of the request, the data erasure management unit 74 of the server device 70 acquires the phone number and the erasure text as the address of the short message of the mobile phone 10 from the erasure text database 78, and uses the erasure text as the text. Each mobile phone managed by the data erasure management unit 74 is requested to the short message communication unit 77 to transmit a short message (hereinafter referred to as “information erasure message”) having the telephone number as the telephone number of the cellular phone 10. The deletion status of the mobile phone 10 is set to “delivery standby”, and the deletion status is displayed on the administrator fixed terminal 60.

  The short message communication unit 77 that has received the transmission request for the information erasure message transmits the short message to the mobile phone 10 via the transmission / reception unit 73, the mobile communication network 40, and the base station 41, and the message has already been transmitted. This is notified to the data erasure management unit 74. The data erasure management unit 74 that has received the notification that transmission has been completed sets the erasure status for the mobile phone 10 to “distribution complete” and causes the administrator fixed terminal 60 to display the erasure status.

  The short message communication unit 55 of the mobile phone 10 that has received the information deletion message via the antenna 17, the transmission / reception unit 22 and the communication control unit 32 performs the information deletion processing S10. The information erasure process S10 stores the short message in the communication history data section 56 and transmits a delivery confirmation message along the reverse route to the reception as shown in the broken line frame in FIG. Returning to FIG. 8, the short message communication unit 77 of the server device 70 that has received the delivery confirmation message notifies the data erasure management unit 74 of the delivery confirmation. Subsequently, the data erasure management unit 74 which has received the notification of delivery confirmation sets the erasure status of the mobile phone 10 to “waiting for delivery confirmed erasure” and causes the administrator fixed terminal 60 to display the erasure status.

  On the other hand, in the mobile phone 10 that has transmitted the delivery confirmation message, whether or not the short message communication unit 55 performs message analysis and information deletion in the message analysis determination unit 54 in the information deletion processing S10 of FIG. Request a determination. The message analysis determination unit 54 that has received the request performs analysis determination S11.

  As shown in FIG. 10, the analysis determination process S11 first analyzes whether or not the transmission source telephone number is the telephone number of the server device 70 in step S15. In step S18, it is determined that erasure is not performed, and the analysis determination process S11 is terminated. On the other hand, if it is the telephone number of the server device 70, the process proceeds to step S16, where it is analyzed whether the message body is an erasing body. If the message body is not a body for erasure, it is determined in step S18 that erasure is not performed, and the analysis determination process S11 is terminated. If it is determined that the erasure is not performed, the erasure process is not performed, and the mobile phone 10 performs an operation when a normal message is received and enters a standby state. On the other hand, if the message body is a body for erasure, it is determined in step S17 that the message is to be deleted, and the analysis determination processing S11 is terminated.

  If it is determined that deletion is to be performed, the process returns to FIG. 9 and the message analysis determination unit 54 requests the phonebook data deletion unit 52 to delete. The telephone directory data erasure unit 52 that has received the erasure request erases all the information in the communication history data unit 56 and the contact data unit 57. When the erasure is completed, the telephone directory data erasure unit 52 notifies the information erasure completion report unit 53 that the erasure is completed.

  The information erasure completion report unit 53 notified that the erasure is completed uses the communication control unit 32, the transmission / reception unit 22, and the antenna 17, which is the same route as the case of the erasure body text registration, by http communication, A report is made that the deletion of the communication history data part 56 and the contact data part 57 has been completed.

  Returning to FIG. 8, the erasure completion report receiving means 75 of the server device 70 that has received the report that the erasure is completed notifies the data erasure management unit 74 that the information erasure is completed, and the received data The erasure management unit 74 sets the erasure status of the mobile phone 10 to “deletion complete” and causes the administrator fixed terminal 60 to display the erasure status. Further, the erasure completion report receiving means 75 obtains an e-mail address for notifying from the erasure text database 78 when the completion report is made, and the e-mail with the text that the erasure is completed is obtained. Requests transmission to the e-mail communication unit 76.

  The e-mail communication unit 76 transmits the requested e-mail to the mobile phone 62 of the user 63 via the transmission / reception unit 72, the Internet network 45, the Internet connection server 80, the mobile communication network 40, and the base station 41. The e-mail received by the mobile phone 62 is confirmed by the user 63.

  As described above, in the present embodiment, the phone book application 50 activated for the first time on the mobile phone 10 prompts the user 63 to input a text to be deleted, and when the input is completed, the text to be deleted is stored in the server device. 70. The server device 70 stores the received erasure text and the like.

  Next, when the administrator 61 of the mobile phone including the mobile phone 10 requests the server device 70 to delete the phone book data of the mobile phone 10, the server device 70 sets the deletion text as the text. An information deletion message, which is a short message to be transmitted, is transmitted to the mobile phone 10. The mobile phone 10 that has received the information deletion message analyzes the transmission source telephone number and the text, and determines whether to delete the phone book data.

  When it is determined that the phone book data is to be deleted, the phone book data of the phone book application 50 is deleted, and when the deletion is completed, the server device 70 is notified of the completion of information deletion. Receiving the report, the server device 70 transmits an information deletion completion e-mail to the user 63.

  Therefore, according to the present embodiment, information recorded on the mobile phone 10 that is not at hand can be deleted. Further, the manager 61 of the mobile phone including the mobile phone 10 can confirm whether or not the erasure has been performed by reporting that the erasure has been completed. 63 can also be confirmed by receiving an e-mail from the server device 70.

  Further, according to the present embodiment, the administrator 61 can issue an instruction to delete the information of the mobile communication terminal device by accessing the server system via the Internet, wherever it is. In addition, the manager 61 can manage a plurality of mobile phones in a lump by having the server system manage the erasure text of each mobile phone including the mobile phone 10.

  In addition, since short messages are used, terminals that can be transmitted are limited compared to Internet e-mails, and the telephone number of the transmission source must be the server device 70 according to the determination requirements of the message analysis determination unit 54. As a result, if the server device 70 cannot be accessed, a message including the text for erasure cannot be sent, and a higher security system can be constructed.

  In addition, personal information and trade secret information can be protected by setting the communication history data and contact data to be erased. Further, since the information to be erased is information handled only by the phone book application 50, the phone book application 50 that has received the information erase message only needs to erase information handled only by its own application. It is possible to prevent erasure failure due to being used by other applications.

  Further, if the user 63 normally uses the telephone directory application 50, the information is deleted, so there is no need to consciously distinguish and store the information to be deleted. Accordingly, it is possible to prevent erasure from being leaked even if the storage is not to be performed when erasing.

  Further, since the phone book application 50 is described in a general-purpose language that does not depend on the execution environment, the phone book application 50 can be used even in a terminal having a different execution environment. Further, when the telephone directory application 50 is always activated, the mobile communication terminal device is turned on, and information can be deleted when wireless communication is possible.

  In addition, once the text for erasure is registered in the server device 70, the input screens 90 and 95 are not displayed on the mobile phone 10, and even if the mobile communication terminal device is stolen or lost, it is erased. Since the main text cannot be modified, the information can be erased more reliably.

  In the present embodiment, the mail is a short message having a telephone number as an address, but may be an e-mail.

  In the present embodiment, the user inputs the telephone number of the mobile phone 10 in the input box 97. However, the mobile phone number may be automatically input or transmitted. Good.

  In the present embodiment, when the phone book application 50 is first activated, the items input by the user are the deletion mail text, the deletion completion notification address, the name, and the mobile phone number. The telephone number of the device may be further added, or items other than these may be added.

  Further, in the present embodiment, the information used for the analysis determination process is the transmission source telephone number and the text of the message. However, the information included in other messages such as the information included in the message header may also be used. Good.

  In addition, although the report of the completion of erasure is made to the server device 70, a communication terminal other than the server device 70 may be used. Further, although the erasure completion report uses http communication, it may be mail or communication using another protocol.

  Further, in the present embodiment, the e-mail transmitted by the server device 70 that has received the erasure completion report is the user 63 of the mobile phone 10, but of course it may be another transmission destination. It is.

  In the present embodiment, if it is determined in step S17 that erasure is to be performed, erasure is performed. However, before erasure is performed, information to be erased is transmitted to the server device 70 or the like. The information to be deleted may be reused by saving it in the server device 70 or the like.

  In the present embodiment, the server device 70 which is a single device is used as the server system. However, a server system realized by a plurality of devices may be used.

  In the present embodiment, the contact data and the communication history data as the specific information are simply information handled by the telephone book application 50 that is a predetermined application, but are handled only by the predetermined application. It may be that it cannot be handled by other applications. In this case, it is possible to prevent an erasure failure such that data cannot be erased because it is used by another application.

  In the present embodiment, a mobile phone is used as the mobile communication terminal device, but other mobile communication terminal devices may be used.

  As described above, the information erasing method and information erasing system of the present invention can be applied to a system including a mobile communication terminal device having a mail function and a terminal device that transmits mail to the mobile communication terminal device. The mobile communication terminal device of the present invention can be applied to a mobile communication terminal device having a mail function. The program of the present invention can be applied to a mobile communication terminal device.

1 is a diagram schematically showing an information erasing system 100 according to an embodiment of the present invention. It is a figure which shows schematically the external appearance structure of the mobile telephone 10 of FIG. It is a figure which shows schematically the internal system 11 of the mobile telephone 10 of FIG. It is a figure which shows schematically the software program part 27 of the internal system 11 of FIG. It is a figure which shows schematically the internal structure of the server apparatus 70 of FIG. It is a sequence diagram for demonstrating registration of the text for erasure | elimination etc. in the information erasure | elimination system 100 of FIG. It is a figure showing the information input screen for registration of the text for erasure | elimination etc. in the mobile telephone 10 of FIG. It is a figure for demonstrating the information erasing method in the information erasing system 100 of FIG. It is a sequence diagram for demonstrating information erasure | elimination process S10 of FIG. It is a flowchart for demonstrating analysis determination process S11 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,62 ... Mobile phone (mobile communication terminal device), 11 ... Internal system, 12 ... Operation part, 13 ... Display part, 14 ... Speaker for call, 15 ... Microphone, 16 ... Speaker for guidance, 17 ... Antenna, 21 ... Control unit, 22 ... Transmission / reception unit, 27 ... Software program unit, 30 ... General purpose application unit, 31 ... Basic processing unit, 32 ... Communication control unit, 33 ... Display control unit, 40 ... Mobile communication network, 41 ... Base station, 45 ... Internet network, 50 ... Phonebook application, 51 ... Erase text registration part (erase information recording means), 52 ... Phonebook data eraser (information eraser), 53 ... Information erasure completion report part (erase completion report part) 54 ... Message analysis determination unit (mail analysis determination means), 55 ... Short message communication unit, 56 ... Communication history data unit, 57 ... Contact data unit, 60 ... fixed terminal for manager, 61 ... manager, 63 ... user, 70 ... server device (server system), 71 ... control unit, 72, 73 ... transmission / reception unit, 74 ... data deletion management unit, 75 ... reception of deletion completion report Means 76... E-mail communication section 77. Short message communication section (mail transmission means) 78... Erase text database (erase information storage means) 80. Internet connection server 90 and 95. 92, 96, 97 ... input box, 100 ... information erasing system.

Claims (11)

An information erasing method for erasing specific information that is described in a program language that can be used universally in different execution environments and that is handled only by a predetermined application executed in a mobile communication terminal device,
A mail transmission step of transmitting to the mobile terminal device a mail including erasure information that is information for erasing the specific information;
A mail analysis determination step of determining whether the predetermined application is a mail for receiving and analyzing the mail transmitted in the mail transmission step and deleting the specific information including the erasure information; ;
In a case where a positive determination is made in the mail analysis determination step, the predetermined application includes an information deletion step of deleting the specific information,
The information erasing method, wherein the predetermined application is always activated when the mobile communication terminal device is powered on.   2. The information according to claim 1, further comprising an erasure completion reporting step of reporting that erasure is completed via a mobile communication network when the specific information is erased in the information erasure step. Erasing method. An erasure requesting step for requesting erasure of the specific information from a server system on the network storing the erasure information;
The information erasing method according to claim 1, wherein the mail transmission step is performed when the erasure request step is performed in the server system.   The information erasing method according to claim 1, wherein the erasing information is information included in a transmission source address and a text of the mail.   5. The information erasing method according to claim 1, wherein the e-mail is a short message having a transmission / reception address as a telephone number.   6. The information erasing method according to claim 1, wherein the specific information includes contact information having at least a name, a telephone number, and an e-mail address as information items. Prior to the mail sending step, further comprising an erasing information determination step for determining at least a part of the erasing information,
7. The information erasing method according to claim 1, wherein the erasing information determination step cannot be performed until the information erasing step is completed once it is performed. Erasure information recording means for recording and holding specific information handled only by a predetermined application written in a program language that can be used in general in different execution environments;
Mail receiving means for receiving mail;
Mail analysis determining means for analyzing the mail received by the mail receiving means and determining whether the mail is for deleting the specific information;
And an information erasure unit for erasing the specific information when a positive determination is made in the mail analysis determination unit,
The mobile communication terminal apparatus, wherein the predetermined application is always activated when the power is on. With a mobile communication network;
A mobile communication terminal device according to claim 8, connected to the mobile communication network;
Connected via the mobile communication network, written in a program language that can be used universally in different execution environments for the mobile communication terminal device, and only by a predetermined application executed on the mobile communication terminal device A server system that transmits an email including erasure information that is information for erasing the specific information to be handled.   The server system has a function of transmitting an email including the erasure information to each of a plurality of mobile communication terminal devices, and manages the erasure state of the specific information for each of the plurality of mobile communication terminal devices. The information erasing system according to claim 9. A program that handles specific information written in a programming language that can be used universally in different execution environments,
Mail receiving procedure to receive mail;
A mail analysis determination procedure for analyzing the mail received by the mail reception procedure and determining whether the mail is for deleting the specific information;
A program for causing a processing device of a mobile communication terminal device that is turned on to always execute an information erasure procedure for erasing the specific information when a positive determination is made in the mail analysis determination procedure.

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