JP2008011218A - Portable terminal and portable terminal system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal and a portable terminal system which are capable of preserving data concerning evidence necessary for criminal investigation. <P>SOLUTION: The portable terminal system comprises portable terminals and a management device. The portable terminal is equipped with a terminal storage unit where special data are stored, an input unit through which an instruction for the erasure of special data is inputted, a terminal transmission unit which transmits the special data to a management device for storage when the erasure instruction is inputted, an erasing unit which erases out the special data from the terminal storage, a record forming unit which forms an erasure record indicating that the special data are erased out, and an erasure record storage which stores the erasure record and comprises a memory that is not allowed to be erased out. The management device is equipped with a device receiving unit which receives the special data from the portable terminal, and a stored data memory unit which stores the received special data as the stored data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable terminal and a portable terminal system for preventing erasure of evidence data by a criminal, and in particular, a portable terminal capable of holding an erasure record of evidence data and transferring and storing the erased evidence data, and The present invention relates to a mobile terminal system.

  In recent years, it has become common for a business staff or a diplomat of a company to store the business data of the company inside a portable terminal such as a mobile phone or a personal digital assistant (PDA), carry it, and carry out work outside the company. It's getting on. However, in addition to business data, mobile terminals may contain important data such as data related to customer privacy and confidential corporate data. Such mobile terminals are stolen or lost. If this happens, important data will be leaked, and there will be a problem that it will be impossible to protect the privacy of customers and keep corporate confidentiality.

  On the other hand, a service for remotely erasing important data when a portable terminal is stolen or lost is known. When erasing important data using this service, the user calls the management device of the mobile carrier (communication company) and sends a request to erase data in the terminal. Based on the erasure request from the user, the management device transmits an important data erasure command to the user's portable terminal. Then, the mobile terminal that has received the erasure command erases the important data and prevents leakage of the important data.

Patent Document 1 below discloses a technique related to a portable information device having a data saving function and a data saving method. This portable information device includes a sensor that detects a feature value related to acceleration, vibration, tilt change, position information, and the like, and if the feature value detected by the sensor exceeds a preset threshold value, The information device itself determines that an abnormality such as theft or loss has occurred. The portable information device transmits important data designated by the user in advance among the data stored therein to the external device designated in advance, and then deletes the internal data.
JP 2002-325280 A

  However, in recent years, crimes using mobile terminals have frequently occurred, and there is concern about the abuse of the above technology by criminals.

  For example, when a criminal group that systematically uses mobile terminals is subjected to police investigation and the mobile terminal is seized by the police, from data such as an address book or e-mail stored inside the seized mobile terminal, There is a risk that evidence of criminal existence and crime will be discovered. However, if the above-mentioned service is abused, the criminal group can erase important data from a remote location, and there is a problem that intentional evidence data can be erased.

  In addition, when a criminal using a mobile terminal with a digital camera to which the technology of Patent Document 1 is applied, for example, when a voyeurism is found, if the mobile terminal is thrown away, the mobile terminal has an abnormality. Judgment and deletion of important data including evidence data such as sneak shot images. Therefore, there is a problem that the evidence data for the voyeurism is lost and there is no record in which the evidence data is erased, so that the police cannot confirm on the spot.

  Therefore, a portable terminal and a portable terminal system that can maintain evidence data for criminal investigations have been desired.

  The present invention adopts the following configuration in order to solve the above points.

<Configuration 1>
The mobile terminal according to the first invention is communicable with a management device arranged in the mobile base station, a terminal storage unit storing special data, and an input unit for inputting an erasure command for the special data; When the erasure command is input, a terminal transmission unit that transmits special data to the management device to store the special data, an erasure unit that erases the special data from the terminal storage unit, and an erasure record indicating that the special data has been erased A record generation unit to be generated and an erasure record storage unit that stores the generated erasure record and includes an erasable memory are provided.

  The portable terminal according to the first aspect of the present invention can further include a terminal display unit that displays the erasure record.

  The portable terminal may include a terminal receiving unit that receives an erasure command from the management device as the input unit.

  The mobile terminal according to the first invention includes a current status detection unit that detects the current status of the mobile terminal, and a terminal status determination unit that determines whether or not the detected current status is a erasure requirement that requires erasing special data And an instruction generation unit that generates an erasure instruction and sends it to the input unit when it is determined that the erasure is required.

  In this case, the current state detection unit includes an acceleration detection unit that detects acceleration information of the mobile terminal, and the terminal state determination unit has a change amount of the acceleration information detected by the acceleration detection unit equal to or less than a predetermined threshold. The determination is made based on whether or not there is.

  In addition, the current state detection unit includes a vibration detection unit that detects vibration information of the mobile terminal, and the terminal state determination unit has a change amount of vibration information detected by the vibration detection unit equal to or less than a predetermined threshold. The determination is made based on whether or not.

  Further, the current state detection unit includes an inclination detection unit that detects inclination information of the mobile terminal, and the terminal state determination unit has a change amount of the inclination information detected by the inclination detection unit equal to or less than a predetermined threshold. The determination is made based on whether or not.

  The current state detection unit includes a position detection unit that detects position information of the mobile terminal, and the terminal state determination unit determines whether the position information detected by the position detection unit is within a predetermined area. Based on the above, a determination is made.

<Configuration 2>
A mobile terminal system according to a second invention includes a mobile terminal and a management device arranged in the mobile base station and capable of communicating with the mobile terminal. The mobile terminal stores terminal data in which special data is stored. , An input unit for inputting an erasure command for special data, a terminal transmission unit for transmitting special data to the management device when the erasure command is input, and an erasing unit for erasing special data from the terminal storage unit And a recording generation unit that generates an erasure record indicating that the special data is erased, and an erasure record storage unit that stores the erasure record and includes an erasable memory, and the management device receives the special data from the portable terminal. An apparatus receiving unit for receiving and a storage data storage unit for storing the received special data as storage data are provided.

  In the mobile terminal system according to the second invention, the mobile terminal can further include a terminal display unit for displaying the erasure record.

  In the mobile terminal system, the management device is a device command generation unit that generates an erase command based on an erase request for special data sent from a user of the mobile terminal, and a device that transmits the generated erase command to the mobile terminal A transmission unit. In this case, the mobile terminal includes a terminal reception unit that receives an erasure command from the management device as an input unit.

  In the mobile terminal system according to the second aspect of the invention, the mobile terminal determines whether or not the current status detected by the current status detection unit that detects the current status of the mobile terminal is a erasure requiring special data to be erased. And a command generation unit that generates an erasure command and sends it to the input unit when it is determined that the erasure is required.

  In this case, the current state detection unit includes an acceleration detection unit that detects acceleration information of the mobile terminal, and the terminal state determination unit has a change amount of the acceleration information detected by the acceleration detection unit equal to or less than a predetermined threshold. The determination is made based on whether or not there is.

  In addition, the current state detection unit includes a vibration detection unit that detects vibration information of the mobile terminal, and the terminal state determination unit has a change amount of vibration information detected by the vibration detection unit equal to or less than a predetermined threshold. The determination is made based on whether or not.

  Further, the current state detection unit includes an inclination detection unit that detects inclination information of the mobile terminal, and the terminal state determination unit has a change amount of the inclination information detected by the inclination detection unit equal to or less than a predetermined threshold. The determination is made based on whether or not.

  The current state detection unit includes a position detection unit that detects position information of the mobile terminal, and the terminal state determination unit determines whether the position information detected by the position detection unit is within a predetermined area. Based on the above, a determination is made.

<Configuration 3>
According to a third aspect of the present invention, there is provided a mobile terminal for storing special data as a storage data, a terminal storage unit for storing special data, an input unit for inputting an erasure command for the special data, and when the erasure command is input. A transfer unit for transferring, an erasing unit for erasing special data from the terminal storage unit, a record generating unit for generating an erasure record indicating that the special data has been erased, and a non-erasable memory for storing the generated erasure record And an archive data storage unit including a memory that stores the transferred archive data and is set with an erase lock.

  The portable terminal according to the third aspect of the present invention can further include a terminal display unit that displays the erasure record.

  In the portable terminal, the stored data storage unit can further set a read lock.

  In this case, the mobile terminal can be connected to a dedicated reading device arranged in the mobile base station, and the storage data storage unit can execute the storage data reading process by releasing the reading lock by the dedicated reading device. .

  The portable terminal further includes a terminal control unit that erases the stored data by releasing the erasure lock set in the stored data storage unit after a predetermined period.

  The mobile terminal is capable of communicating with a management device arranged in a mobile base station, and includes a terminal reception unit that receives an erasure command from the management device as an input unit.

  A mobile terminal according to a third aspect of the present invention includes a current status detection unit that detects the current status of the mobile terminal, and a terminal status determination unit that determines whether or not the detected current status is a erasure requirement that requires erasing special data And an instruction generation unit that generates an erasure instruction and sends it to the input unit when it is determined that the erasure is required.

  In this case, the current state detection unit includes an acceleration detection unit that detects acceleration information of the mobile terminal, and the terminal state determination unit has a change amount of acceleration information detected by the acceleration detection unit equal to or less than a predetermined threshold. The determination is made based on whether or not there is.

  In addition, the current state detection unit includes a vibration detection unit that detects vibration information of the mobile terminal, and the terminal state determination unit has a change amount of vibration information detected by the vibration detection unit equal to or less than a predetermined threshold. The determination is made based on whether or not.

  Further, the current state detection unit includes an inclination detection unit that detects inclination information of the mobile terminal, and the terminal state determination unit has a change amount of the inclination information detected by the inclination detection unit equal to or less than a predetermined threshold. The determination is made based on whether or not.

  The current state detection unit includes a position detection unit that detects position information of the mobile terminal, and the terminal state determination unit determines whether the position information detected by the position detection unit is within a predetermined area. Based on the above, a determination is made.

<Configuration 4>
A mobile terminal system according to a fourth invention includes a mobile terminal having a terminal storage unit in which special data is stored, and a management device disposed in the mobile base station and capable of communicating with the mobile terminal. An apparatus includes a device command generation unit that generates an erasure command for special data based on an erasure request for special data sent from a user of the mobile terminal, and a device transmission unit that transmits the generated erasure command to the mobile terminal. The mobile terminal includes a terminal receiving unit that receives an erasing command from the management device, a transfer unit that transfers special data as archival data when the erasing command is received, and a special data from the terminal storage unit. An erasing unit for erasing, a recording generating unit for generating an erasing record indicating that special data has been erased, an erasing record storing unit for storing the generated erasing record and comprising an erasable memory, Stored and erased locked storage data, characterized in that it comprises a storage data storage unit comprising a memory that is set.

  In the mobile terminal system according to the fourth aspect of the invention, the mobile terminal can further include a terminal display unit that displays the erasure record.

  In the portable terminal system, the stored data storage unit is further set with a read lock.

  In this case, the mobile terminal can be connected to a dedicated reading device arranged in the mobile base station, and the storage data storage unit can execute the storage data reading process by releasing the reading lock by the dedicated reading device. .

  In the mobile terminal system, the mobile terminal further includes a terminal control unit that cancels the erasure lock set in the storage data storage unit after a predetermined period of time and erases the storage data.

  According to the portable terminal and portable terminal system of the present invention, the erasure record is generated for the special data stored in the portable terminal and is stored in the non-erasable memory inside the portable terminal. Confirmation of the facts made is possible. Further, even when evidence data is intentionally erased by a criminal, the erased data is transferred and stored, so that the evidence data for criminal investigation can be preserved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram illustrating a configuration of a mobile terminal and a mobile terminal system according to Embodiment 1 of the present invention.
As shown in FIG. 1, a mobile terminal system 10 according to the present invention includes a user's mobile terminal 11 and a management device 13 that is arranged in a mobile base station and can communicate with the mobile terminal 11 by radio. Composed.
Using this mobile terminal system 10, the user of the mobile terminal 11 sends an erasure request to the management apparatus 13 by a predetermined method (described later), thereby remotely transferring special data stored in the mobile terminal 11. Can be erased.

The mobile terminal 11 is a user's mobile phone in this embodiment, and as shown in FIG. 1, a terminal storage unit 14, an erasure unit 15, a record generation unit 16, an erasure record storage unit 17, a terminal display unit 18, and a terminal A communication unit 19 and a terminal control unit 20 for controlling these units are provided.
In this embodiment, it is assumed that the portable terminal 11 is used by a criminal and that evidence data relating to the crime is stored therein.
In the present embodiment, the telephone number “090-1111-2233” of the mobile terminal 11 is used as the predetermined identification information for identifying the mobile terminal 11.

  The terminal storage unit 14 includes a memory that can be written, referenced, and erased, and is a storage area in which special data designated in advance by the user is stored. In this embodiment, the special data stored in the terminal storage unit 14 is evidence data related to crime.

  The erasing unit 15 has a function of erasing special data from the terminal storage unit 14 based on an erasing command to be described later.

  When the special data is erased from the terminal storage unit 14 by the erasure unit 15, the record generation unit 16 generates an erasure record indicating that erasure based on the erasure command has been executed, and stores it in the erasure record storage unit 17 to be described later. send.

  The erasure record storage unit 17 includes a non-erasable memory, and is a storage area for storing the erasure record sent from the record generation unit 16. The data stored in the erasure record storage unit 17 can be additionally written and referenced.

FIG. 2 is an explanatory diagram showing an example of the configuration of the erasure record storage unit.
In this embodiment, as shown in FIG. 2, the erasure record storage unit 17 is provided with an erasure date / time item 21, a file name item 22, and a storage information item 23.

  The erase date / time item 21 stores erase date / time information indicating the date / time when the special data was erased based on the erase command. The file name item 22 stores file names of a plurality of files included in the deleted special data. Further, the storage information item 23 stores storage information indicating the storage status of special data.

  For example, in the erasure record storage unit 17 shown in FIG. 2, “2006/04/01 00:15:20” is stored in the erasure date / time item 21, and the corresponding file name item 22 contains the file name. “A, B, C...” Is stored. That is, in the portable terminal 11, the erasure process based on the erasure command for the special data including the file “A, B, C...” Was executed at 00:15:20 on April 1, 2006. Is shown. Further, the corresponding storage information item 23 stores storage information “The erased data is stored in the management device of xxx (communication company name) ...”.

  The terminal display unit 18 includes, for example, a liquid crystal display, and has a function of displaying various screens. In the present embodiment, the terminal display unit 18 displays the erasure record stored in the erasure record storage unit 17.

The terminal communication unit 19 has functions as a terminal transmission unit and a terminal reception unit, and transmits and receives data to and from the management device 13. In this embodiment, the terminal communication unit 19 transmits a telephone number “090-1111-2233” as predetermined identification information for identifying the mobile terminal 11 when transmitting data to the management apparatus 13. .
In addition, as the predetermined identification information transmitted by the terminal communication unit 19, for example, a manufacturing number or an e-mail address of the mobile terminal 11 can be adopted instead of the telephone number.

  The terminal control unit 20 has a function of controlling the above-described units 14 to 19.

  As shown in FIG. 1, the management device 13 includes a device communication unit 24, a storage data storage unit 25, a device command generation unit 26, and a device control unit 27 for controlling these units.

  The device communication unit 24 functions as a device transmission unit and a device reception unit, and transmits and receives data to and from the mobile terminal 11.

  The storage data storage unit 25 is a storage area in which special data received from the mobile terminal 11 by the device communication unit 24 is stored as storage data.

FIG. 3 is an explanatory diagram illustrating a configuration of the storage data storage unit according to the first embodiment.
As shown in FIG. 3, the storage data storage unit 25 is provided with a storage data item 28 and a reception date / time item 29 corresponding to the telephone number of the mobile terminal for each mobile terminal.

  In the storage data item 28, special data received from the mobile terminal 11 is stored as storage data. The special data received from the portable terminal 11 can be stored in a folder in another storage area, and the folder name can be stored in the storage data item 28.

  The reception date / time item 29 stores the date / time when the special data is received from the mobile terminal 11.

  For example, in the storage data storage unit 25 shown in FIG. 3, the storage data item 28 corresponding to the telephone number “090-1111-2233” stores “storage data 1” as storage data. The corresponding reception date / time item 29 stores “2006/04/01 00:15:20”. That is, the management device 13 indicates that special data was received at 00:15:20 on April 1, 2006 from the mobile terminal 11 having the telephone number “090-1111-2233”.

  The device command generation unit 26 has a function of generating an erasure command for special data stored in the mobile terminal 11. In the present embodiment, the generation of the erasure command by the device command generation unit 26 is performed when the user of the portable terminal 11 sends an erasure request for special data to the management device 13 by a predetermined method described later. It shall be executed based on.

  The device control unit 27 has a function of controlling the above-described units 24 to 26.

  As described above, the user of the portable terminal 11 can erase the special data by sending an erasure request by a predetermined method. As a method of transmitting the erasure request, for example, there is a method of sending an erasure request for special data to the management device 13 from another telephone terminal via a telephone line or from a terminal device or the like via the Internet.

  Next, when this function is abused and the mobile terminal 11 is seized by the police, another telephone terminal is transferred to the management device 13 by the input of a criminal who is the user of the mobile terminal 11 or a friend of the criminal. FIG. 4 shows the operation of the portable terminal system 10 when an erasure request for special data and the telephone number “090-1111-2233” of the portable terminal 11 are sent to delete special data, ie, evidence data. It demonstrates along a flowchart.

  FIG. 4 is a flowchart showing the operation in the first embodiment of the portable terminal system according to the present invention.

  In the management device 13, when the device communication unit 24 receives the erasure request and the telephone number “090-1111-2233” of the portable terminal 11, the received erasure request is temporarily sent to the device control unit 27. Send to storage.

  The device control unit 27 controls the device command generation unit 26 based on the erasure request received from the device communication unit 24 to generate an erasure command (S101).

  Subsequently, the device control unit 27 controls the device communication unit 24 to transmit the generated deletion command to the mobile terminal 11 having the telephone number “090-1111-2233” stored in the temporary storage unit ( S102).

  When the terminal communication unit 19 of the mobile terminal 11 receives an erasure command from the management device 13, the terminal control unit 20 sends the special data stored in the terminal storage unit 14 together with the telephone number “090-1111-2233” to the terminal. It transmits to the management apparatus 13 by the communication part 19 (S103).

  When the device communication unit 24 of the management device 13 receives the special data and the telephone number from the mobile terminal 11, the device control unit 27 sets the received special data as “stored data 1” and receives the received phone number “090-1111-”. The stored data storage unit 25 stores the received date and time in association with “2233” (S104). As shown in FIG. 3, the telephone number “090-1111-2233” of the portable terminal 11 is written in the storage data storage unit 25, and the received special data is stored in the corresponding storage data item 28 as “ Also, the date and time “2006/04/01 00:15:20” at which the device communication unit 24 received the special data is written in the received date and time item 29 as “stored data 1”.

  In the portable terminal 11, when the terminal communication unit 19 completes transmission of the special data to the management device 13 (S103), the terminal control unit 20 controls the erasing unit 15 to delete the special data from the terminal storage unit 14. (S105).

  Subsequently, the terminal control unit 20 controls the record generation unit 16 to generate an erasure record indicating that the special data has been erased from the terminal storage unit 14 by the erasure unit 15, and the erasure record is stored in the erasure record storage unit. 17 is written (S106). As shown in FIG. 2, the erasure record storage unit 17 has an erasure date “2006/04/01 00:15:20” and file names “A, B, C... ", And the storage information" The erased data is stored in the management device of XXX (communication company name) ... "is written.

  Thereafter, the terminal control unit 20 displays the erasure record on the terminal display unit 18 (S107).

FIG. 5 is an explanatory diagram showing the erasure record displayed on the terminal display unit.
As shown in FIG. 5, the terminal display unit 18 displays a message indicating that the data has been deleted, the date and time of deletion, the name of the deleted file, and the storage information of the deleted data.

  As described above, in order for a criminal to intentionally delete evidence data, a deletion request for special data including evidence data stored in the portable terminal is sent to the management device, and the management device based on the deletion request Even when special data including evidence data is deleted after the deletion command is generated and transmitted to the criminal's mobile terminal, the deletion record stored in the memory locked for deletion is also displayed on the terminal display unit of the mobile terminal. The police can easily confirm the fact that the data has been deleted. Since the erased special data is sent to the management device and stored, the evidence data is preserved, and the police stores the data stored in the mobile carrier (communication company) that has authority over the management device. Evidence data can be obtained by requesting submission of

  In the present embodiment, the erased special data is transmitted to and stored in the mobile carrier management device. However, for example, it can be stored in another memory inside the mobile terminal. This will be described in detail in the second embodiment.

  In this embodiment, the erasure command for special data is generated in the management device and transmitted to the mobile terminal. However, it is also possible to adopt a configuration in which a command generation unit for generating an erasure command is provided in the mobile terminal. . In this case, for example, the mobile terminal itself erases the special data based on a configuration in which an erasure command is generated when the user calls the mobile terminal a predetermined number of times or a detection value detected from a sensor provided in the mobile terminal. A configuration that determines whether or not to perform the process and generates an erasure command based on the determination result may be considered. The generation of the erasure command by the mobile terminal itself will be described in detail in the second embodiment.

  In this embodiment, the user's mobile phone is used as the mobile terminal. However, for example, a personal digital assistant (PDA) can also be used.

FIG. 6 is a block diagram illustrating a configuration of the mobile terminal according to the second embodiment of the present invention.
When the mobile terminal 40 detects the occurrence of an abnormality based on each piece of information detected by the detection unit provided therein and determines that the special data should be deleted, the mobile terminal 40 stores the special data stored therein. It has a function of automatically erasing data.
In the present embodiment, the same configurations and operations as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  In this embodiment, the mobile terminal 40 is a user's mobile phone. As shown in FIG. 6, the terminal storage unit 14, the deletion unit 15, the record generation unit 16, the deletion record storage unit 17, the terminal display unit 18, A detection unit 41, a terminal status determination unit 42, an instruction generation unit 43, an input unit 44, a transfer unit 45, a stored data storage unit 46, and a terminal control unit 47 for controlling these units are provided.

  In the present embodiment, the current state detection unit 41 includes an acceleration detection unit 48, a vibration detection unit 49, an inclination detection unit 50, and a position detection unit 51 in order to detect the current state of the mobile terminal 40.

  The acceleration detection unit 48 includes an acceleration sensor, and detects a change in acceleration applied to the mobile terminal 40 as acceleration change information.

  The vibration detection unit 49 includes a vibration sensor and detects vibration information of the mobile terminal 40.

  The inclination detection unit 50 includes an inclination sensor, and detects a change in inclination of the mobile terminal 40 as inclination change information.

  The position detection unit 51 includes, for example, a GPS (Global Positioning System) module, performs positioning of the portable terminal 40 using a satellite, and detects position information of the portable terminal 40.

  In addition, as a detection part with which the present condition detection part 41 is provided, it is also possible to employ | adopt the sound detection part etc. which detect sound information, for example.

  The terminal status determination unit 42 includes a threshold value storage unit 52, and determines the terminal status of the mobile terminal 40 based on each threshold value (described later) stored in the threshold value storage unit 52 and the current status detected by the current status detection unit 41. It has the function to do.

  The threshold value storage unit 52 stores a threshold value for each detection value detected by the acceleration detection unit 48, the vibration detection unit 49, the inclination detection unit 50, and the position detection unit 51 provided in the current state detection unit 41.

  For example, when the acceleration change information detected by the acceleration detection unit 48 is equal to or greater than the threshold for the acceleration change information stored in the threshold storage unit 52, the terminal status determination unit 42 determines that the terminal status of the mobile terminal 40 is special. It is determined that data is to be erased, that is, a situation requiring erasure. Similarly, when the vibration information detected by the vibration detection unit 49 is greater than or equal to the threshold for the vibration information stored in the threshold storage unit 52, or the inclination change information detected by the inclination detection unit 50 is stored in the threshold storage unit 52. When it is more than the threshold value with respect to the stored inclination change information, the terminal status determination unit 42 determines that the terminal status is the erasure required status. In addition, when the position detection information detected by the position detection unit 51 is not within the range of the threshold for the position information stored in the threshold storage unit 52, that is, when the mobile terminal 40 does not exist within the predetermined area, the terminal status determination unit 42 determines that the terminal status is the erasure required status.

  The instruction generation unit 43 has a function of generating an erasure instruction for special data when the terminal state determination unit 42 determines that the erasure is required. The generated erasure command is sent to the input unit 44.

  The input unit 44 has a function of inputting an erasure command received from the command generation unit 43.

  The transfer unit 45 has a function of transferring special data stored in the terminal storage unit 14 to a storage data storage unit 46 described later in order to store the special data as storage data.

The storage data storage unit 46 includes a memory in which an erasure lock is set, and is a storage area in which storage data transferred by the transfer unit 45 is stored.
In the present embodiment, the stored data storage unit 46 includes a memory that cannot be referred to by the portable terminal 40 alone. In order to refer to the data stored in the stored data storage unit 46, the stored data storage unit 46 is owned by the mobile carrier. The read lock set in the stored data storage unit 46 must be released by connecting to a dedicated read device. Moreover, the authorized person who can release the reading lock is limited to the mobile carrier and the police, and the user himself / herself cannot refer to the data. Further, for example, a personal identification number or a personal identification key is used for releasing the lock, and these are composed of an amount of information that cannot be estimated by others, and the data stored in the stored data storage unit 46 is stored by others. It is practically impossible to refer to.
Further, the storage data stored in the storage data storage unit 46 is timed from the storage date and time by a timer, and when a predetermined period elapses, the terminal control unit 47 releases the erasure lock and enables erasure. .

  The terminal control unit 47 has a function of controlling each unit described above.

  Subsequently, the operation of the mobile terminal 40 when a criminal using the mobile terminal 40 of the present embodiment finds a voyeurism and throws away the mobile terminal 40 to escape, according to the flowchart shown in FIG. explain. It is assumed that the criminal has made a setting in advance so that a captured image serving as evidence data of the voyeur action is stored in the terminal storage unit 14 as special data.

  FIG. 7 is a flowchart showing the operation of the mobile terminal according to the second embodiment of the present invention.

  When the portable terminal 40 is in a power-on state, the detection units 48 to 51 of the current state detection unit 41 are always in a detection state, and each piece of detected information is sent to the terminal state determination unit 42. The terminal status determination unit 42 is a status in which the terminal status is to delete special data based on the information sent from the current status detection unit 41 and the threshold values stored in the threshold value storage unit 52, that is, the deletion required status. It is determined whether or not (S201).

  As described above, when a criminal using the mobile terminal 40 finds a voyeurism and throws away the mobile terminal 40 to escape, the acceleration information of the mobile terminal greatly changes, and the terminal status determination unit 42 Then, it is determined that the terminal status is the erasure required status (S201). If it is determined that the erasure is required, the command generation unit 43 generates a deletion command for the special data under the control of the terminal control unit 47 (S202). The generated erasure command is sent to the input unit 44 and input (S202).

  When the erasing command is input, the terminal control unit 47 controls the transfer unit 45 to transfer the special data stored in the terminal storage unit 14 to the storage data storage unit 46 so as to store it as storage data. (S203).

  Subsequently, the terminal control unit 47 controls the deleting unit 15 to delete the special data from the terminal storage unit 14 (S204).

  Next, the terminal control unit 47 controls the record generation unit 16 to generate an erasure record indicating that the special data has been erased from the terminal storage unit 14 by the erasure unit 15, and the erasure record is stored in the erasure record storage unit. 17 is written (S205).

  Thereafter, the terminal control unit 20 displays the erasure record on the terminal display unit 18 (S206).

FIG. 8 is an explanatory diagram illustrating an erasure record displayed on the terminal display unit according to the second embodiment.
As shown in FIG. 8, the terminal display unit 18 displays a message indicating that the data has been deleted, the date and time of deletion, the name of the deleted file, and the storage information of the deleted data. can do.

  As described above, the mobile terminal itself detects a situation where special data should be erased, abuses the function of erasing the special data, and the criminal intentionally creates special data including evidence data maliciously. Even if the data is erased, the erased data is transferred and stored, so that the evidence data can be preserved. The police can confirm the fact of erasure on the spot by looking at the erasure record displayed on the terminal display. Furthermore, the special data to be erased is transferred to the memory in which the deletion lock inside the mobile terminal is set, so that even if the mobile terminal is out of the communication range with the mobile base station, evidence data can be securely stored. Become.

  In this embodiment, the user's mobile phone is used as the mobile terminal. However, for example, a personal digital assistant (PDA) can also be used.

It is a block diagram which shows the structure of the portable terminal and portable terminal system which concern on Example 1 of this invention. It is explanatory drawing which shows an example of a structure of the erasing record memory | storage part. FIG. 3 is an explanatory diagram illustrating a configuration of a stored data storage unit according to the first embodiment. It is a flowchart which shows the operation | movement in Example 1 of the portable terminal system which concerns on this invention. It is explanatory drawing which shows the deletion record displayed on the terminal display part of Example 1. FIG. It is a block diagram which shows the structure of the portable terminal which concerns on Example 2 of this invention. It is a flowchart which shows the operation | movement in Example 2 of the portable terminal which concerns on this invention. It is explanatory drawing which shows the deletion record displayed on the terminal display part of Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mobile terminal system 11, 40 Mobile terminal 13 Management apparatus 14 Terminal memory | storage part 15 Erasing part 16 Record production | generation part 17 Erasing record memory | storage part 18 Terminal display part 19 Terminal communication part 24 Device communication part 25 Storage data storage part 26 Device command production | generation part

Claims (32)

A mobile terminal capable of communicating with a management device arranged in a mobile base station,
A terminal storage unit for storing special data;
An input unit for inputting an erasure command for the special data;
When the erasure command is input, a terminal transmission unit that transmits the special data to the management device to store the special data;
An erasing unit for erasing the special data from the terminal storage unit;
A record generation unit for generating an erasure record indicating that the special data has been erased;
An erasure record storage unit that stores the generated erasure record and includes an erasable memory;
A portable terminal comprising:   The mobile terminal according to claim 1, further comprising a terminal display unit that displays the erasure record. The mobile terminal according to claim 1, wherein the input unit includes a terminal reception unit that receives the erasure command from the management device. A current state detection unit for detecting the current state of the mobile terminal;
A terminal status determination unit that determines whether or not the detected current status is an erasure requirement that requires erasure of the special data;
When it is determined that the erasure is required, an instruction generation unit that generates the erasure instruction and sends it to the input unit;
The mobile terminal according to claim 1, further comprising: The current status detection unit
An acceleration detector for detecting acceleration information of the mobile terminal;
The terminal status determination unit
The portable terminal according to claim 4, wherein the determination is performed based on whether or not a change amount of the acceleration information detected by the acceleration detection unit is equal to or less than a predetermined threshold value. The current status detection unit
A vibration detection unit for detecting vibration information of the mobile terminal;
The terminal status determination unit
The portable terminal according to claim 4, wherein the determination is performed based on whether or not a change amount of the vibration information detected by the vibration detection unit is equal to or less than a predetermined threshold value. The current status detection unit
An inclination detector for detecting inclination information of the mobile terminal;
The terminal status determination unit
The mobile terminal according to claim 4, wherein the determination is performed based on whether or not a change amount of the tilt information detected by the tilt detection unit is equal to or less than a predetermined threshold value. The current status detection unit
A position detection unit for detecting position information of the mobile terminal;
The terminal status determination unit
The mobile terminal according to claim 4, wherein the determination is performed based on whether the position information detected by the position detection unit is within a predetermined region. A mobile terminal system including a mobile terminal and a management device arranged in a mobile base station and capable of communicating with the mobile terminal,
The portable terminal is
A terminal storage unit for storing special data;
An input unit for inputting an erasure command for the special data;
When the erasure command is input, a terminal transmission unit that transmits the special data to the management device to store the special data;
An erasing unit for erasing the special data from the terminal storage unit;
A record generation unit for generating an erasure record indicating that the special data has been erased;
An erasure record storage unit that stores the erasure record and includes an erasable memory;
With
The management device
A device receiver for receiving the special data from the mobile terminal;
A storage data storage unit for storing the received special data as storage data;
A portable terminal system comprising: The portable terminal is
The mobile terminal system according to claim 9, further comprising a terminal display unit that displays the erasure record. The management device
An apparatus command generating unit that generates the erasure command based on an erasure request for the special data sent from a user of the mobile terminal;
A device transmission unit for transmitting the generated erasure command to the mobile terminal;
Further comprising
In the mobile terminal,
The portable terminal system according to claim 9, wherein the input unit includes a terminal reception unit that receives the erasure command from the management device. The portable terminal is
A current state detection unit for detecting the current state of the mobile terminal;
A terminal status determination unit that determines whether or not the detected current status is an erasure requirement that requires erasure of the special data;
When it is determined that the erasure is required, an instruction generation unit that generates the erasure instruction and sends it to the input unit;
The mobile terminal according to claim 9, further comprising: The current status detection unit
An acceleration detector for detecting acceleration information of the mobile terminal;
The terminal status determination unit
The mobile terminal system according to claim 12, wherein the determination is performed based on whether or not a change amount of the acceleration information detected by the acceleration detection unit is equal to or less than a predetermined threshold value. The current status detection unit
A vibration detection unit for detecting vibration information of the mobile terminal;
The terminal status determination unit
The portable terminal system according to claim 12, wherein the determination is performed based on whether or not a change amount of the vibration information detected by the vibration detection unit is equal to or less than a predetermined threshold value. The current status detection unit
An inclination detector for detecting inclination information of the mobile terminal;
The terminal status determination unit
The mobile terminal system according to claim 12, wherein the determination is performed based on whether or not a change amount of the tilt information detected by the tilt detection unit is equal to or less than a predetermined threshold value. The current status detection unit
A position detection unit for detecting position information of the mobile terminal;
The terminal status determination unit
The mobile terminal system according to claim 12, wherein the determination is performed based on whether or not the position information detected by the position detection unit is within a predetermined region. A terminal storage unit for storing special data;
An input unit for inputting an erasure command for the special data;
When the erasure command is input, a transfer unit that transfers the special data to be stored as storage data,
An erasing unit for erasing the special data from the terminal storage unit;
A record generation unit for generating an erasure record indicating that the special data has been erased;
An erasure record storage unit that stores the generated erasure record and includes an erasable memory;
A storage data storage unit comprising a memory for storing the transferred storage data and setting an erasure lock;
A portable terminal comprising:   The mobile terminal according to claim 17, further comprising a terminal display unit that displays the erasure record.   18. The portable terminal according to claim 17, wherein a read lock is further set in the storage data storage unit. It can be connected to a dedicated readout device located in the mobile base station,
20. The portable terminal according to claim 19, wherein the storage data storage unit can execute the storage data reading process by releasing the reading lock by the dedicated reading device.   The mobile terminal according to claim 17, further comprising: a terminal control unit that releases the erasure lock set in the storage data storage unit after a predetermined period of time and erases the storage data. It is possible to communicate with a management device arranged in a mobile base station,
The mobile terminal according to claim 17, wherein the input unit includes a terminal reception unit that receives the erasure command from the management device. A current state detection unit for detecting the current state of the mobile terminal;
A terminal status determination unit that determines whether or not the detected current status is an erasure requirement that requires erasure of the special data;
When it is determined that the erasure is required, an instruction generation unit that generates the erasure instruction and sends it to the input unit;
The mobile terminal according to claim 17, further comprising: The current status detection unit
An acceleration detector for detecting acceleration information of the mobile terminal;
The terminal status determination unit
The mobile terminal according to claim 23, wherein the determination is performed based on whether or not a change amount of the acceleration information detected by the acceleration detection unit is equal to or less than a predetermined threshold value. The current status detection unit
A vibration detection unit for detecting vibration information of the mobile terminal;
The terminal status determination unit
The mobile terminal according to claim 23, wherein the determination is performed based on whether or not a change amount of the vibration information detected by the vibration detection unit is equal to or less than a predetermined threshold value. The current status detection unit
An inclination detector for detecting inclination information of the mobile terminal;
The terminal status determination unit
The mobile terminal according to claim 23, wherein the determination is performed based on whether or not a change amount of the tilt information detected by the tilt detection unit is equal to or less than a predetermined threshold value. The current status detection unit
A position detection unit for detecting position information of the mobile terminal;
The terminal status determination unit
The mobile terminal according to claim 23, wherein the determination is performed based on whether or not the position information detected by the position detection unit is within a predetermined area. A mobile terminal system including a mobile terminal having a terminal storage unit in which special data is stored, and a management device disposed in the mobile base station and capable of communicating with the mobile terminal,
The management device
An apparatus command generation unit that generates an erasure command for the special data based on an erasure request for the special data sent from the user of the mobile terminal;
A device transmission unit for transmitting the generated erasure command to the mobile terminal;
With
The portable terminal is
A terminal receiver that receives the erasure command from the management device;
When the erasure command is received, a transfer unit that transfers to store the special data as storage data;
An erasing unit for erasing the special data from the terminal storage unit;
A record generation unit for generating an erasure record indicating that the special data has been erased;
An erasure record storage unit that stores the generated erasure record and includes an erasable memory;
A storage data storage unit comprising a memory for storing the transferred storage data and setting an erasure lock;
A portable terminal system comprising: The portable terminal is
The mobile terminal system according to claim 28, further comprising a terminal display unit that displays the erasure record.   29. The portable terminal system according to claim 28, wherein the stored data storage unit is further set with a read lock. The mobile terminal can be connected to a dedicated reading device arranged in the mobile base station,
31. The portable terminal system according to claim 30, wherein the storage data storage unit can execute the storage data reading process by releasing the reading lock by the dedicated reading device. The portable terminal according to claim 28, further comprising a terminal control unit that releases the erasure lock set in the storage data storage unit after a predetermined period of time and erases the storage data. Terminal system.

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