JP2009230218A - Communication terminal and application deletion method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably delete data used by an application program when deleting the application program. <P>SOLUTION: A cellphone 1 having a non-contact type IC chip 107 includes: an application memory 11 for storing an IC application controlling the IC chip; a data memory 12 for storing data for the IC application; a presence information memory 13 for storing data presence information showing that the data are stored in the memory 12; a reception part 14 receiving the IC application to be deleted; a decision part 15 deciding whether the data presence information corresponding to the IC application is stored in the memory 13 or not; a data deletion part 16 deleting the data for the IC application when the data presence information is stored in the memory 13; and an application deletion part 17 deleting the IC application thereafter. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication terminal and an application deletion method for deleting an application program that uses a non-contact type IC chip.

  Conventionally, non-contact IC technology has been widely used. This non-contact IC technology is used for transmitting and receiving data between devices, and is generally realized by a device (for example, a non-contact IC card or a mobile phone) equipped with a non-contact IC chip and an external device. Yes. Specifically, data is transmitted by transmitting and receiving weak radio waves between the non-contact type IC chip and the external device. Such non-contact IC technology is applied to railway tickets and electronic money.

For example, Patent Document 1 below describes an information providing system including a portable terminal having a non-contact type IC chip and an information providing apparatus having a reader / writer that performs wireless communication with the chip. In this information providing system, an information providing apparatus transmits transmission target information such as a URL (Uniform Resource Locator) to a portable terminal via a reader / writer, and the portable terminal transmits the transmission target information via a non-contact type IC chip. Receive. Accordingly, the mobile terminal can display the received transmission target information or other information based on the transmission target information using a predetermined application program (for example, a Web browsing application program).
JP 2006-85669 A

  Depending on the device on which the non-contact type IC chip is mounted, an application program using the non-contact type IC chip can be added or deleted as necessary (for example, a mobile phone). On the other hand, in the non-contact type IC chip, there is data dedicated to the program stored by an application program in order to control the IC chip. For this reason, when an application program is deleted, data used by the program may remain. In this case, the storage capacity of the non-contact type IC chip may be compressed, or remaining data may be read out.

  The present invention has been made to solve the above problems, and provides a communication terminal and an application deletion method capable of reliably deleting data used by an application program when the application program is deleted. Objective.

  The communication terminal of the present invention is a communication terminal including a non-contact type IC chip, and is provided in an application memory for storing an application program capable of controlling the non-contact type IC chip, and in the non-contact type IC chip. The data memory that can store the data used by the application program stored in the memory for memory and the data memory provided in the non-contact type IC chip and used by the application program stored in the memory for data Presence information memory capable of storing data presence information indicating that it is stored in the memory, reception means for receiving an input of a deletion signal indicating an application program to be deleted, and an application indicated by the deletion signal received by the reception means Corresponding to the program The determination means for determining whether or not the data presence information is stored in the presence information memory, and when the determination means determines that the data presence information is stored in the presence information memory, the reception means accepts it. A data deletion means for deleting data used by the application program indicated by the received deletion signal from the data memory, and an application program indicated by the deletion signal received by the reception means after the data is deleted by the data deletion means. Application deletion means for deleting from the application memory.

  The application deletion method of the present invention includes a non-contact IC chip, an application memory for storing an application program capable of controlling the non-contact IC chip, and the application memory provided in the non-contact IC chip. A data memory capable of storing data used by the application program stored in the memory, and a data memory provided in the non-contact type IC chip and used by the application program stored in the application memory An application deletion method in a communication terminal including a presence information memory capable of storing data presence information indicating that it is stored in a reception step of receiving an input of a deletion signal indicating an application program to be deleted; Receptionist A determination step for determining whether or not the data presence information corresponding to the application program indicated by the deletion signal received in the memory is stored in the presence information memory, and the data presence information is stored in the presence information memory in the determination step. When it is determined that the data used in the application program indicated by the deletion signal received in the reception step is deleted from the data memory, and after the data is deleted in the data deletion step, And an application deletion step of deleting the application program indicated by the deletion signal received in the reception step from the application memory.

  According to such a communication terminal and an application deletion method, first, based on the received deletion signal, it is determined whether or not the data presence information corresponding to the application program to be deleted is stored in the presence information memory. The The fact that the data presence information is stored in the presence information memory means that the data used by the application program to be deleted is stored in the data storage means. In this case, first, data used by the application program is deleted, and then the application program is deleted. Therefore, when the application is deleted, the data used by the application can be surely deleted. As a result, the storage capacity in the non-contact type IC chip can be secured, and reading of data that is no longer used can be prevented. It becomes possible. Such an effect is particularly remarkable when the non-contact IC chip has a small storable capacity or when the communication terminal can be carried.

  In the communication terminal of the present invention, the data presence information is stored in any of a plurality of predetermined storage areas corresponding to the application program, and the determination means stores the data presence information in any of the plurality of storage areas. It is preferable to determine whether or not.

  In this case, a predetermined plurality of storage areas corresponding to the application program are provided in the presence information memory, and the data presence information is stored in any of the plurality of storage areas. In this way, by storing the data presence information in the storage area corresponding to the application program, the data presence information is stored in association with the application program. As a result, the data presence information can be stored more efficiently.

  In the communication terminal according to the present invention, when the application deleting unit determines that the data presence information is not stored in the presence information memory by the determining unit, the application program indicated by the deletion signal received by the receiving unit is It is preferable to delete it from the general memory.

  The fact that the data presence information is not stored in the presence information memory means that the data used by the application program to be deleted is not stored in the data storage unit. In this case, the application program to be deleted is immediately deleted. In this way, by changing the deletion processing method according to the presence / absence of the data presence information, it becomes possible to delete the application program and the data used by the application program by an optimum method.

  According to such a communication terminal and application deletion method, the data is deleted based on the data presence information indicating the presence of data used by the application program, and then the application program is deleted. Data can be reliably deleted when the application program is deleted.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

  First, a cellular phone (communication terminal) 1 according to an embodiment will be described with reference to FIGS. FIG. 1 is a diagram illustrating a hardware configuration of the mobile phone 1. FIG. 2 is a diagram showing a functional configuration of the mobile phone 1 shown in FIG. FIG. 3 is a diagram showing a configuration of the presence information memory 13 shown in FIG. FIG. 4 is a diagram illustrating an example of definition information. FIG. 5 is a diagram showing a collation process between the data presence information and the comparison data.

  As shown in FIG. 1, the mobile phone 1 includes a CPU 101 that executes an operating system, an application program, and the like, a main storage unit 102 that includes a ROM and a RAM, an auxiliary storage unit 103 that includes a memory, and a mobile unit (not shown) A communication control unit 104 that performs data communication via a communication network, a display unit 105 that includes a liquid crystal monitor, an operation unit 106 that includes keys for inputting characters and numbers, and execution instructions, a non-contact IC chip 107, and A chip antenna 108 is provided. Since the mobile phone 1 includes the non-contact type IC chip 107, the user of the mobile phone 1 can use services using the non-contact type IC technology (railway ticket service, electronic money service, etc.).

  The non-contact type IC chip 107 is an electronic component that operates with electricity generated by radio waves received from an external device (not shown) by the chip antenna 108 and transmits / receives data to / from the external device. The non-contact type IC chip 107 includes a CPU 107a, a ROM 107b that stores application programs, a RAM 107c that is used to temporarily store data when the application program is executed, and an EEPROM (Electronically Erasable and EEPROM) that stores user data. Programmable Read Only Memory) 107d and a communication unit 107e that transmits and receives data via the chip antenna 108.

  As shown in FIG. 2, the cellular phone 1 includes application memory 11, data memory 12, presence information memory 13, reception unit 14, determination unit 15, data deletion unit 16, and application deletion unit 17 as functional components. It has. Each function realized by these constituent elements reads predetermined software on the CPU 101 and the main storage unit 102 shown in FIG. 1, operates the non-contact type IC chip 107 under the control of the CPU 101, and This is realized by reading and writing data in the storage unit 102 and the auxiliary storage unit 103. In the non-contact type IC chip 107, software stored in the ROM 107b is read onto the CPU 107a, and data is read from and written to the RAM 107c, the EEPROM 107d, and the like under the control of the CPU 107a. It operates by performing transmission / reception processing.

  The application memory 11 is a recording medium that stores an application program (hereinafter referred to as “IC application”) that can control the non-contact type IC chip 107. The IC application outputs, for example, a command for transmitting / receiving data to / from an external device or a command for executing reading / writing of data to / from the EEPROM 107d to the non-contact IC chip 107. The chip 107 is controlled. The IC application is received based on a download instruction or the like input via the operation unit 106 and stored in the application memory 11. Examples of the IC application include a railway ticket application, an electronic money application, and a purchase point management application.

  The data memory 12 is a recording medium provided in the non-contact type IC chip 107 and capable of storing data used by the IC application stored in the application memory 11. The data used by the IC application includes data that can be read by the IC application, data that is stored in association with the application in order for the IC application to operate.

  The presence information memory 13 is provided in the non-contact type IC chip 107 and includes data presence information indicating that data used by the IC application stored in the application memory 11 is stored in the data memory 12. It is a memory for presence information that can be stored.

  The presence information memory 13 is hierarchically configured with four types of concepts of system, area, service, and block. That is, the presence information memory 13 is composed of one or more systems, the system is composed of one or more areas, the areas are composed of one or more services, and the services are composed of one or more blocks.

  For example, as shown in FIG. 3, the presence information memory 13 includes a system A identified by a system code “8049” and a system B identified by a system code “0001”. The system A includes an area A1 identified by an area code “10000001” and an area A2 identified by an area code “2000001”. Area A1 includes service A11 identified by service code “1000000B” and service A12 identified by service code “1000001B”. The service A11 is composed of a plurality of blocks B1 to Bn. One data presence information is stored at a predetermined bit position in one block. That is, the presence information memory 13 has a plurality of storage areas (a plurality of blocks), and the data presence information is stored in any of the plurality of blocks.

  More specifically, the data presence information is an ID uniquely assigned to each IC application. When the mobile phone 1 receives (downloads) an IC application from an external server (not shown), the data presence information is received in a form included in definition information downloaded together with the application. The definition information is stored in the application memory 11 in association with the IC application.

  The definition information includes a system code, an area code, a service code, a block list, bit information, and data presence information. For example, the definition information A shown in FIG. 4 includes a system code “8049”, an area code “10000001”, a service code “1000000B”, a block list “3: 3087, 5321, 2390”, bit information “5, 30”, and data existence. It consists of information “000... 01234”. The numerical value “3” in the block list is the number of blocks (hereinafter referred to as “candidate blocks”) in which data presence information may be stored, and “3087, 5321, 390” is the identification number of the candidate block. It is a list. The bit information indicates a write or read position of the data presence information, and is composed of a write (read) start position (bit start position) in a certain block and a bit length of the data presence information. In the example of FIG. 4, the bit start position is “5” and the bit length is “30”.

  The data presence information is written into the presence information memory 13 at a timing specific to the corresponding IC application. When the IC application and definition information are downloaded, the data presence information is not yet written. Data corresponding to an IC application based on information communicated between the mobile phone 1 and a predetermined server (not shown) when the user of the mobile phone 1 makes the IC application usable by a predetermined operation. Presence information is written into the presence information memory 13. The location where the data presence information is written is one of the candidate blocks described in the definition information.

  The state in which the IC application can be used means that data necessary for the operation of the application is stored in the data memory 12 and the application is activated (a service can be used via the application). State). In the case of an application for electronic money, a state in which data relating to electronic money transactions is stored in the data memory 12 and the application is activated (a state in which electronic money is issued) is a state in which the application can be used. Therefore, the data presence information is information indicating that data used by the IC application stored in the application memory 11 is stored in the data memory 12.

  The receiving unit 14 is a receiving unit that receives an input of a deletion signal indicating an IC application to be deleted. This deletion signal includes an application ID for identifying the IC application to be deleted. The method for receiving the deletion signal is not limited. For example, the reception unit 14 may receive a deletion signal indicating a deletion instruction input by the user of the mobile phone 1 via the operation unit 106, or may receive a deletion signal output by another application program. The reception unit 14 outputs the received deletion signal to the determination unit 15.

  The receiving unit 14 receives an instruction input by the user via a screen output by the data deleting unit 16 or the application deleting unit 17 described later, and outputs the instruction to the data deleting unit 16 or the application deleting unit 17 as an instruction signal. To do. The contents of the instruction signal will be described later.

  The determination unit 15 is a determination unit that determines whether data presence information corresponding to the application program indicated by the deletion signal received by the reception unit 14 is stored in the presence information memory 13.

  Specifically, the determination unit 15 acquires an application ID included in the deletion signal input from the reception unit 14 and extracts definition information corresponding to the application ID from the application memory 11. Subsequently, the determination unit 15 scans a plurality of candidate blocks specified by the system code, area code, service code, and block list included in the definition information, and data (block data) stored in each candidate block To get. Subsequently, the determination unit 15 extracts a specific bit string (hereinafter referred to as “comparison data”) from each block data based on the bit information included in the definition information. Subsequently, the determination unit 15 performs bit conversion on the data presence information (data presence information corresponding to the application ID) included in the definition information, and the bit length defined in the definition information from the converted bit data. Extract data. Subsequently, the determination unit 15 collates the plurality of comparison data with the bit data extracted from the data presence information.

  If there is comparison data that matches the bit data extracted from the data presence information as a result of the collation, the determination unit 15 determines that the data presence information is stored in the presence information memory 13. Then, the determination unit 15 generates a data deletion signal including the acquired application ID and outputs the data deletion signal to the data deletion unit 16. On the other hand, when there is no comparison data that matches the bit data extracted from the data presence information, the determination unit 15 determines that the data presence information is not stored in the presence information memory 13. Then, the determination unit 15 generates an application deletion signal including the acquired application ID and outputs it to the application deletion unit 17.

  An example of collation is shown in FIG. The example of FIG. 5 is based on the definition information A shown in FIG. Further, it is assumed that the data presence information “000... 01234” is stored in the candidate block “3087”. In this case, the determination unit 15 acquires block data of each candidate block “2390”, “3087”, and “5321” based on the definition information A. Subsequently, the determination unit 15 extracts 30-bit comparison data for the 5th to 34th bits from each block data. Thereby, the comparison data “001... 100”, “111... 100”, and “100... 000” are extracted from the candidate blocks “2390”, “3087”, and “5321”. Subsequently, the determination unit 15 performs bit conversion on the data presence information “000... 01234” and extracts bit data “111... 100” for 30 bits from the converted bit data. Subsequently, the determination unit 15 collates the three pieces of comparison data with the bit data extracted from the data presence information. In the example of FIG. 5, since the block data extracted from the candidate block “3087” matches the bit data extracted from the data presence information, a data deletion signal is generated and output to the data deletion unit 16.

  Returning to FIG. 2, the data deletion unit 16 is an application indicated by the deletion signal received by the reception unit 14 when the determination unit 15 determines that the data presence information is stored in the presence information memory 13. This is data deletion means for deleting data used by the program from the data memory 12.

  The data deletion unit 16 acquires the application ID from the data deletion signal input from the reception unit 14. Subsequently, the data deletion unit 16 outputs a confirmation screen (hereinafter referred to as “data deletion confirmation screen”) for inquiring of the user whether or not to execute the data deletion processing to the display unit 105. Thereafter, the data deletion unit 16 acquires an instruction input by the user using the data deletion confirmation screen as an instruction signal input via the reception unit 14. The instruction signal acquired by the data deletion unit 16 is of two types: a signal indicating execution of data deletion and a signal indicating processing stop.

  When the input instruction signal indicates execution of data deletion, the data deletion unit 16 activates the IC application identified by the application ID in the data deletion mode. The activated IC application deletes related data (data used by the IC application) stored in the data memory 12 from the data memory 12. The IC application that has completed the data deletion process ends the process by a user operation. Note that the IC application may automatically terminate the process after the data deletion process is completed without depending on the user's operation. After the data deletion processing by the IC application is completed, the data deletion unit 16 generates an application deletion signal including the input application ID and outputs the application deletion signal to the application deletion unit 17.

  On the other hand, when the input instruction signal indicates that the process is to be stopped, the data deletion unit 16 ends the process without executing the data deletion.

  The application deletion unit 17 is an application deletion unit that deletes the IC application indicated by the deletion signal received by the reception unit 14 from the application memory 11 after data is deleted by the data deletion unit 16. The application deletion unit 17 also determines that the IC application indicated by the deletion signal received by the reception unit 14 is stored in the application memory when the determination unit 15 determines that the data presence information is not stored in the presence information memory 13. It is also a means for deleting from 11.

  The application deletion unit 17 acquires an application ID from the application deletion signal input from the data deletion unit 16 or the determination unit 15. Subsequently, the application deletion unit 17 outputs a confirmation screen (hereinafter referred to as “application deletion confirmation screen”) for inquiring of the user whether or not to execute the application deletion processing to the display unit 105. Thereafter, the application deletion unit 17 acquires an instruction input by the user using the application deletion confirmation screen as an instruction signal input via the reception unit 14. The instruction signal acquired by the application deletion unit 17 is of two types: a signal indicating execution of application deletion and a signal indicating processing stop.

  When the input instruction signal indicates execution of application deletion, the application deletion unit 17 deletes the IC application identified by the application ID from the application memory 11. On the other hand, when the input instruction signal indicates that the process is to be stopped, the application deletion unit 17 ends the process without executing the application deletion.

  Next, with reference to FIGS. 6 and 7, the processing of the mobile phone 1 will be described and the application deletion method according to the present embodiment will be described. FIG. 6 is a flowchart showing processing of the mobile phone 1 shown in FIG. FIG. 7 is an example of a screen output during the process shown in FIG.

  Here, a case where the user of the mobile phone 1 operates the application list screen as shown in FIG. 7A to delete the downloaded IC application will be described as an example. The screen shown in FIG. 7A is for allowing the user to select an IC application to be deleted, and a list of IC applications is displayed there. Here, when the user selects an IC application and presses the delete button, the reception unit 14 receives a deletion signal including the application ID of the selected IC application and outputs it to the determination unit 15 (step S11, reception step). In the example shown in FIG. 7A, a deletion signal including the application ID of application B is accepted.

  Subsequently, the determination unit 15 acquires definition information corresponding to the application ID included in the input deletion signal (step S12), and acquires block data based on the definition information (step S13). Specifically, the determination unit 15 acquires block data stored in the candidate block specified by the system code, area code, service code, and block list included in the definition information. Subsequently, the determination unit 15 extracts comparison data from each block data based on the bit information in the definition information (step S14).

  Subsequently, the determination unit 15 determines whether or not the data presence information is stored in the presence information memory 13 by collating the bit data extracted from the data presence information with the comparison data (step S15, Judgment step). At this time, if there is comparison data that matches the bit data extracted from the data presence information (step S15; YES), the determination unit 15 determines that the data presence information is stored in the presence information memory 13. The data deletion signal is output to the data deletion unit 16.

  The data deletion unit 16 to which the data deletion signal is input outputs a data deletion confirmation screen as shown in FIG. 7B to the display unit 105 in order to inquire the user whether or not to execute the data deletion process. When the user clicks the “Yes” button on the data deletion confirmation screen, the data deletion unit 16 activates the IC application identified by the application ID included in the input data deletion signal, and displays the IC application. Data deletion processing is executed (step S16, data deletion step). As a result, data that can be read by the IC application to be deleted is deleted from the data memory 12. Thereafter, the data deletion unit 16 outputs an application deletion signal to the application deletion unit 17.

  The application deletion unit 17 to which the application deletion signal is input outputs an application deletion confirmation screen as shown in FIG. 7C to the display unit 105 in order to inquire whether or not to execute the application deletion process. When the user clicks the “Yes” button on the application deletion confirmation screen, the data deletion unit 16 deletes the IC application identified by the application ID included in the input application deletion signal from the application memory 11. (Step S17, application deletion step).

  On the other hand, when there is no comparison data that matches the bit data extracted from the data presence information (step S15; NO), the determination unit 15 does not store the data presence information in the presence information memory 13. The application deletion signal is output to the data deletion unit 16. In this case, the screen of FIG. 7C is displayed, and the process of step S17 is performed according to the user's button operation.

  As described above, by executing the processes in steps S11 to S17, the IC application designated by the user is deleted together with related data. If the user clicks the “No” button in FIG. 7B or FIG. 7C, the process ends at that point.

  In FIG. 7A, a plurality of processing procedures when a plurality of IC applications are selected are conceivable. First, a method of performing the processes in steps S12 to S17 for each IC application is conceivable. In addition, a method of proceeding while performing the processing of each step for all the deletion target applications is also conceivable.

  As described above, according to the present embodiment, the data used by the IC application is deleted, and then the IC application is deleted. Therefore, the data used by the IC application can be reliably deleted when the IC application is deleted. As a result, it is possible to secure the storage capacity in the non-contact type IC chip 107 and to prevent reading of data that is no longer used. Since the non-contact type IC chip 107 mounted on the mobile phone 1 is small in size and has a small storage capacity, and the mobile phone 1 is often exposed to third parties, such an effect is remarkable.

  In this embodiment, the data presence information is stored in association with the IC application by storing the data presence information in the candidate block corresponding to the IC application program. As a result, the data presence information can be stored more efficiently.

  In this embodiment, if the data presence information is not stored in the presence information memory 13, the IC application to be deleted is immediately deleted. Thus, by changing the deletion processing method according to the presence / absence of data presence information, it is possible to delete the IC application and the data used by the application in an optimum manner.

  The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above embodiment. The present invention can be modified in various ways as described below without departing from the scope of the invention.

  In the above embodiment, the data presence information is stored in any of the plurality of candidate blocks in the presence information memory 13, but the method for storing the data presence information is not limited to this. For example, a method of storing a plurality of data presence information in one storage area without dividing the presence information memory into a plurality of storage areas may be adopted.

  In the above embodiment, the mobile phone 1 is configured to display the data deletion confirmation screen and the application deletion confirmation screen in the deletion process. However, the deletion signal received by the reception unit 14 is displayed without displaying these screens. Based on this, the data and IC application may be deleted unconditionally.

  The type of communication terminal is not limited to a mobile phone. The present invention can be applied to various devices such as a personal computer and a personal digital assistant (PDA).

It is a figure which shows the hardware constitutions of a mobile telephone. It is a figure which shows the function structure of the mobile telephone shown in FIG. It is a figure which shows the structure of the memory for presence information shown in FIG. It is a figure which shows the example of definition information. It is a figure which shows the collation process with data presence information and the data for a comparison. 3 is a flowchart showing processing of the mobile phone shown in FIG. It is an example of the screen output during the process shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cellular phone (communication terminal), 11 ... Application memory, 12 ... Data memory, 13 ... Presence information memory, 14 ... Reception part (reception part), 15 ... Determination part (determination part), 16 ... Data deletion Part (data deletion means), 17... Application deletion part (application deletion means)

Claims (4)

A communication terminal including a non-contact type IC chip,
An application memory for storing an application program capable of controlling the non-contact IC chip;
A data memory provided in the non-contact type IC chip and capable of storing data used by an application program stored in the application memory;
Presence information memory provided in the non-contact type IC chip and capable of storing data presence information indicating that data used by an application program stored in the application memory is stored in the data memory When,
Receiving means for receiving an input of a deletion signal indicating the application program to be deleted;
Determining means for determining whether or not the data presence information corresponding to the application program indicated by the deletion signal received by the receiving means is stored in the presence information memory;
When the determination means determines that the data presence information is stored in the presence information memory, the data used by the application program indicated by the deletion signal received by the reception means is read from the data memory. Data deletion means to be deleted;
Application deletion means for deleting an application program indicated by a deletion signal received by the receiving means from the application memory after data is deleted by the data deleting means;
A communication terminal comprising: The data presence information is stored in one of a plurality of predetermined storage areas corresponding to the application program,
The determination means determines whether the data presence information is stored in any of the plurality of storage areas;
The communication terminal according to claim 1. When the application deletion unit determines that the data presence information is not stored in the presence information memory by the determination unit, the application program indicated by the deletion signal received by the reception unit is used for the application. Remove from memory,
The communication terminal according to claim 1 or 2. A non-contact IC chip, an application memory for storing an application program capable of controlling the non-contact IC chip, and an application program provided in the non-contact IC chip and stored in the application memory are used. Data memory capable of storing data, and data present in the non-contact type IC chip indicating that data used by an application program stored in the application memory is stored in the data memory An application deletion method in a communication terminal comprising a presence information memory capable of storing information,
A reception step of receiving an input of a deletion signal indicating the application program to be deleted;
A determination step of determining whether or not the data presence information corresponding to the application program indicated by the deletion signal received in the reception step is stored in the presence information memory;
When it is determined in the determination step that the data presence information is stored in the presence information memory, the data used by the application program indicated by the deletion signal received in the reception step is transferred from the data memory. A data deletion step to be deleted;
An application deleting step of deleting the application program indicated by the deletion signal received in the receiving step from the application memory after data is deleted in the data deleting step;
An application deletion method comprising:

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