JP2005348038A - Portable communication terminal and privacy protecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the protection level of stored information secret from a third person in a portable communication terminal. <P>SOLUTION: At least secret pictures a to f be shown only in a secrete state, usual pictures i-n to be shown only in the usual state and common pictures g-h to be shown in both the secret and usual states are previously prepared for display screens shown on an LCD display 20. The screen for showing similar kinds of information forms a double layer structure composed of two screens for the secret and usual states. Thus, the screen transition structure of the double layer structure taking two waiting pictures as initial pictures so that data secret from a third person and data open thereto are separately managed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a portable communication terminal with a privacy protection function, and in particular, a portable communication terminal having a privacy protection function for preventing leakage of information such as a telephone directory and a schedule, and information stored in the portable communication terminal. The present invention relates to a privacy protection method for preventing leakage.

  2. Description of the Related Art Conventionally, some mobile communication terminals such as mobile phone terminals are provided with a function for managing a telephone directory and a schedule. For this reason, various personal information is stored in the mobile communication terminal, but due to the nature that the mobile communication terminal is carried on a daily basis, it may be lent or lost to others, There is a possibility that personal information stored in the terminal is known to a third party.

  From the above, some portable communication terminals are provided with various privacy protection functions for preventing information stored in the terminals from being known to a third party (for example, Patent Document 1). See -6).

JP 2000-49924 A JP 2000-307706 A JP 2002-32315 A JP 2002-373140 A JP 2003-249994 A JP 2003-298715 A

  However, in the privacy protection function described in Patent Documents 1-6, in order to prevent leakage of the contents of an e-mail or a telephone number stored in the terminal, and reading or writing of information by a third party, Although setting is made, there is a problem that it is not possible to reliably protect all of the information that the third party does not want to be known.

  An object of the present invention is to solve the above-described problems and improve the protection level of information that is not desired to be known by a third party.

  A mobile communication terminal according to the present invention is a mobile communication terminal (for example, a mobile phone terminal 10) having a function of communicating with another communication terminal via a communication network, and operating means for inputting information in response to a user operation. (For example, the operation unit 60) and user input information input by operating the operation means is classified into secret information (for example, communication partner information of the secret flag 1) and non-secret information (for example, communication partner information of the secret flag 0). Information storage means (for example, memory 31) to be stored, screen display means (for example, LCD display section 20) for displaying the display screen, and display control means (for example, control section 30) for displaying the display screen on the screen display means. ) And an instruction to switch to the secret mode (for example, input of a mode switching password) Accordingly, a secret mode setting means (e.g., control) that sets a secret mode that permits display on the screen display means of a secret screen (e.g., secret screens a to f) that displays secret information stored in the information storage means. Unit 30), and the display control means controls the display of the secret screen on the screen display means when the secret mode is set by the secret mode setting means (for example, control for displaying the secret screen a, secret screen a To the secret screens b to f), and when the secret mode is not set, the non-secret information stored in the information storage means is displayed and the same type of information as the secret screen is displayed. Non-secret screen Klett screen I to N) for displaying a control (e.g., control to display the secret screen i, and performs control) for transitioning from secret screen i Secret screen J～n.

  By configuring as described above, it is possible to manage the display screen in a two-layer structure using a secret screen that is displayed only when in the secret mode and a non-secret screen that is displayed only when not in the secret mode. It is possible to prevent leakage of information simply by canceling the secret mode, and it is possible to improve the protection level of information that is not desired to be disclosed to a third party.

  The secret screen includes a secret standby screen (for example, secret screen a) used as an initial screen when the secret mode is set, and the non-secret screen is used as an initial screen when the secret mode is not set. Including a non-secret standby screen (for example, secret screen i), and when the display control means performs a predetermined screen transition operation by the operation means while displaying the secret standby screen, the display control means When control is performed to transition to another secret screen (for example, secret screens b to f) and a non-secret standby screen is displayed, if there is a predetermined transition operation by the operating means, other than the non-secret standby screen Other non-secret screens ( It may be configured to perform control for shifting in the secret screen J～n) if e.

  The secret information and non-secret information stored in the information storage means include communication partner information for specifying other communication terminals that are communication partners (for example, communication partner information registered in the telephone directory data shown in FIG. 2). ), And when there is information input from another communication terminal (for example, Y in step S501), the communication partner information of the other communication terminal is stored in the information storage means as secret information. (For example, Y in step S502) includes a history storage unit (for example, a part that executes step S503 in the control unit 30) that stores history information related to information input from the other communication terminal as secret information in the information storage unit. It may be.

  The information input from the other communication terminal is an incoming call from the other communication terminal, and the history storage unit receives the other communication when there is an incoming call from the other communication terminal (for example, Y in step S501). When the telephone number that is the communication partner information of the terminal is stored in the information storage means as the secret information (for example, Y in step S502), the incoming call history information indicating that there is an incoming call from the telephone number is stored as the secret information. It may be configured so as to be stored in the information storage means (for example, step S503).

  The information input from the other communication terminal is reception of an e-mail from the other communication terminal, and the history storage unit receives the e-mail from the other communication terminal (for example, Y in step S501). When an e-mail address that is communication partner information of another communication terminal is stored in the information storage means as secret information (for example, Y in step S502), a reception history indicating the contents of e-mail received from the e-mail address The information may be stored in the information storage unit as secret information (for example, step S503).

  The secret information and non-secret information stored in the information storage unit may include schedule information indicating a user's schedule.

  The privacy protection method according to the present invention is stored in an information storage means (for example, the memory 31) provided in a mobile communication terminal (for example, the mobile phone terminal 10) having a function of communicating with another communication terminal via a communication network. A privacy protection method for preventing leakage of secret information, wherein user input information input by operating an operation means (for example, the operation unit 60) provided in the mobile communication terminal is identified as secret information and non-secret information. The mobile communication terminal is provided with a secret screen for displaying secret information stored in the information storage means in response to an instruction to switch to the secret mode by operating the operation means. A secret that allows display on screen display means (for example, LCD display unit 20). When the mode is set and the secret mode is set, the secret screen is controlled to be displayed on the screen display means. When the secret mode is not set, the non-secret information stored in the information storage means is displayed. Control is performed to display a non-secret screen that displays the same type of information as the secret screen.

  By configuring as described above, a screen displaying the mobile communication terminal table with a two-layer structure using a secret screen that is displayed only when in the secret mode and a non-secret screen that is displayed only when not in the secret mode. Can be managed, and leakage of information can be prevented simply by releasing the secret mode, and the protection level of information that is not desired to be known by a third party can be improved.

  The secret screen includes a secret standby screen that is used as an initial screen when the secret mode is set, and the non-secret screen is a non-secret standby screen that is used as an initial screen when the secret mode is not set. In addition, if there is a predetermined screen transition operation by the operating means when the secret standby screen is displayed, control is performed to transition to a secret screen other than the secret standby screen, and the non-secret standby screen is displayed. When there is a predetermined transition operation by the operating means during the display, it may be configured to perform control for transition to a non-secret screen other than the non-secret standby screen.

  The secret information and non-secret information stored in the information storage means include communication partner information for identifying other communication terminals that are communication partners, and there is information input from other communication terminals. In addition, when the communication partner information of the other communication terminal is stored as the secret information in the information storage unit, the history information regarding the information input from the other communication terminal is stored as the secret information in the information storage unit. It may be configured as follows.

  The information input from the other communication terminal is an incoming call from the other communication terminal. When there is an incoming call from the other communication terminal, the telephone number that is the communication partner information of the other communication terminal is the secret information. If the information is stored in the information storage unit, the incoming call history information indicating that an incoming call has been received from the telephone number may be stored in the information storage unit as secret information.

  Information input from another communication terminal is reception of an e-mail from the other communication terminal. When an e-mail is received from the other communication terminal, an e-mail that is communication partner information of the other communication terminal When the address is stored as secret information in the information storage means, the reception history information indicating the reception contents of the e-mail from the e-mail address may be stored as secret information in the information storage means. Good.

  The secret information and non-secret information stored in the information storage unit may include schedule information indicating a user's schedule.

  According to the present invention, it is possible to manage a display screen in a two-layer structure using a secret screen that is displayed only when in the secret mode and a non-secret screen that is displayed only when not in the secret mode. Information leakage can be prevented simply by releasing the mode, and the protection level of information that is not desired to be known by a third party can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an example of the configuration of a mobile phone terminal 10 according to an embodiment of the present invention.

  As shown in FIG. 1, the mobile phone terminal 10 includes an LCD (Liquid Crystal Display) display unit 20, a control unit 30, an antenna 40, a radio unit 50, an operation unit 60, a microphone (microphone) 70, Speaker 80.

  The LCD display unit 20 is based on an instruction from the control unit 30 and displays a standby screen that is displayed when no operation is performed on the terminal 10 and a telephone that displays the contents of the phone book. It has a function to display various screens such as a book screen.

  The control unit 30 includes a memory 31, a CPU 32, and various peripheral circuits (not shown), and has a function of controlling each unit included in the mobile phone terminal 10.

  The memory 31 is constituted by a storage medium such as a RAM, for example, and stores various data such as a telephone directory, outgoing call history, hourly incoming call history, electronic mail box, schedule, image data, moving image data, and control program. A part of the memory 31 may be constituted by a ROM, and a control program may be stored in the ROM part.

  The CPU 32 controls each unit such as the LCD display unit 20, the radio unit 50, the microphone 70, and the speaker 80 in accordance with a control program stored in the memory 31.

  Specifically, for example, the CPU 32 executes various processes such as an image display instruction to the LCD display unit 20 based on an operation signal input from the operation unit 60 by a user operation.

  The radio unit 50 has a function of modulating / demodulating signals. Specifically, the radio unit 50 performs a process of receiving and demodulating a radio signal via the antenna 40. Further, the radio unit 50 has a function of modulating a signal output from the control unit 30 and transmitting a radio signal via the antenna 40.

  The operation unit 60 is configured by an input device such as a button for inputting a telephone number, for example, and has a function of outputting an input signal corresponding to a user operation to the control unit 30.

  The microphone 70 has a function of converting voice uttered by the user during a call into a voice signal and outputting the voice signal to the control unit 30.

  The speaker 80 has a function of outputting various voices such as voice and ringtone based on voice data received via the antenna 40 and the wireless unit 50 during a call.

  The mobile phone terminal 10 of this example digitally converts the analog voice input from the microphone 70 by the control unit 30 during a call and transmits the analog voice via the radio unit 50 and the antenna 40. The voice data received via the antenna 40 and the radio unit 50 during the call is converted into an analog signal by the control unit 30 and output from the speaker 80 as voice.

  FIG. 2 is an explanatory diagram showing an example of a data structure such as telephone directory data stored in the memory 31. As shown in FIG. 2, the telephone directory data is composed of a plurality of communication partner data indicating communication partners that are outgoing / incoming parties based on the telephone function or electronic mail transmission / reception partners based on the electronic mail function. As shown in FIG. 2, the communication partner data is data in which various data relating to the communication partner including, for example, a name, a telephone number, an e-mail address, and a secret function status flag (secret flag) are associated with each other. It is.

  The secret flag is a flag that is set when communication partner data is registered as phone book data by the operation of the operation unit 60 by the user. The secret flag is information that the corresponding call partner data may be known to a third party. It is a flag indicating whether or not there is.

  When the secret flag is set to “1” (when the secret is set), it indicates that the corresponding communication partner data is information that the third party does not want to be known. On the other hand, when the secret flag is reset to “0” (when the secret is not set), it indicates that the corresponding communication partner data is information that may be known to a third party.

  When registration of communication partner data is executed on the telephone directory screen b displayed in a secret state (secret mode) described later, the control unit 30 automatically sets the secret flag to “1”. You may do it. Similarly, when registration of communication partner data is executed on the telephone directory screen n displayed in a normal state (normal mode) described later, the control unit 30 automatically sets the secret flag to “0”. You may make it do.

  As shown in FIG. 2, the memory 31 is provided with an area for storing secret state history data and an area for storing normal state history data. The secret state history data is an area in which history information related to a communication partner for which secret is set is stored. The normal state history data is an area in which history information about a communication partner for which no secret is set is stored.

  In this example, as shown in FIG. 2, the history information is stored in the outgoing mail history indicating the caller's history, the incoming call history indicating the caller's history, and the outgoing mailbox. There are the contents of the transmitted electronic mail and the history of the transmission source, and the contents of the received electronic mail stored in the reception mailbox and the history of the transmission destination. Each piece of history information is stored in the memory 31 by being divided into secret state history data and normal state history data.

  FIG. 3 is a transition diagram of the display screen displayed on the LCD display unit 20 of the mobile phone terminal 10 of this example. In this example, different display screens for displaying the same type of information are displayed on the LCD display unit 20 depending on whether the secret state is present or not. That is, the display screen is managed in a two-layer structure.

  As shown in FIG. 3, the display screen displayed on the LCD display unit 20 displays at least the secret screens a to f displayed only in the secret state and only in the normal state other than the secret state. Normal screens i to n and common screens g to h displayed in both the secret state and the normal state are prepared in advance.

  The secret screen includes a standby screen a, a telephone directory screen b, an outgoing call history screen c, an incoming call history screen d, an incoming mail screen e, and an outgoing mail screen f.

  The normal screen includes a standby screen i, an outgoing call history screen j, an incoming call history screen k, an incoming mail screen l, an outgoing mail screen m, and a telephone directory screen n.

  Thus, in this example, the screen for displaying the same kind of information has a two-layer structure in which two screens for the secret state and for the normal state are provided.

  The standby screen a is a secret standby screen used as a standby screen when the secret state is set, and the standby screen i is a normal standby screen used as a standby screen when the secret state is not set. is there.

  The secret screens b to f are screens that transition from the standby screen a only. Further, the normal screens j to n are screens that transition from the standby screen i only. Furthermore, the common screens g to h are screens that transition from both the secret standby screen a and the normal standby screen i.

  The outgoing call history when the telephone number included in the phone book displayed on the phone book screen b is selected and sent is the secret state history in the memory 31 as outgoing call history information displayed only on the outgoing call history screen c. It is stored in the data storage area (transmission history storage area). The incoming call history when there is an incoming call from the phone number included in the phone book displayed on the phone book screen b is the secret status information in the memory 31 as the incoming call history information displayed only on the incoming call history screen d. It is stored in a history data storage area (incoming history storage area).

  Similarly, a transmission history (such as a destination e-mail address and an e-mail body) when an e-mail is transmitted by selecting an e-mail address included in the phone book displayed on the phone book screen b is as follows: The transmission mail information displayed only on the transmission mail screen f is stored in the storage area (transmission mail box) of the secret state history data in the memory 31. The reception history when an email is received from the email address included in the phone book displayed on the phone book screen b is a secret in the memory 31 as received mail information displayed only on the received mail screen e. It is stored in the storage area for status history data (reception mailbox).

  On the other hand, the outgoing call history when the telephone number included in the phone book displayed on the phone book screen n is selected and sent is the normal state in the memory 31 as the outgoing call history information displayed only on the outgoing call history screen j. Is stored in a storage area for historical data (transmission history storage area). Further, the incoming call history when there is an incoming call from the telephone number included in the phone book displayed on the phone book screen n is used for the normal state in the memory 31 as the incoming call history information displayed only on the incoming call history screen k. It is stored in a history data storage area (incoming history storage area).

  Similarly, the transmission history when an e-mail is transmitted by selecting an e-mail address included in the phone book displayed on the phone book screen n is sent mail information displayed only on the outgoing mail screen m. It is stored in a storage area (transmission mailbox) of normal state history data in the memory 31. The reception history when an email is received from the email address included in the phone book displayed on the phone book screen n is normally stored in the memory 31 as received mail information displayed only on the received mail screen l. It is stored in the storage area for status history data (reception mailbox).

  Note that screens other than the screen shown in FIG. 3 are also provided with two screens for the secret state and for the normal state, and have a two-layer structure. For example, the schedule saved when set to the secret state is saved on the schedule function screen that can be changed only from the standby screen a for secret, and the schedule saved when set to the normal state is used for normal use. Is stored in the schedule function screen that can be changed only from the standby screen i.

  As described above, in this example, the screen transition structure has a two-layer structure in which the two standby screens are the initial screens, and the data that the third party does not want to be known and the data that may be known are separated from each other. I try to manage it.

Next, setting of the secret function will be described.
FIG. 4 is an explanatory diagram illustrating an example of a display state of a secret function setting screen for setting a function and a password in the secret state. Note that the secret function setting screen is, for example, the common screen g. However, it is desirable that the secret function setting screen is not displayed unless a predetermined password set in the terminal 10 is input so that the setting is not made by another person or the setting content is not changed.

  As shown in FIG. 4, in the secret function setting screen, various items for which the secret function can be set and the normal state (normal standby screen i) is changed to the secret state (secret standby screen a). A mode switching password input area for shifting is provided.

  On the secret function setting screen, in accordance with the operation of the operation unit 60 by the user, the secret function is set (ON) for the item desired by the user, and the mode switching password is set.

  Then, the items for which the secret function is set are managed in a two-layer structure. In addition, when the mode switching password is input by operating the operation unit 60 on the normal standby screen i, the screen transits to the secret standby screen a.

  The transition from the secret standby screen a to the normal standby screen i is performed, for example, by pressing a mode switching button provided on the secret standby screen a or a button provided on the side of the terminal 10 or the like. This is done by a simple operation such as long press.

Next, the operation of the mobile phone terminal 10 will be described in detail.
FIG. 5 is a flowchart showing an example of history information registration processing executed by the mobile phone terminal 10 according to the embodiment of the present invention.

  In the history information registration process, the control unit 30 first checks whether or not a call has arrived or received, a call has arrived, an e-mail has been sent, or an e-mail has been received (step S501). That is, it is confirmed whether or not communication with the communication partner is performed via a communication network (for example, a general public line network, the Internet, etc.).

  When communication with the communication partner is executed (Y in step S501), the control unit 30 uses the telephone number or e-mail address of the communication partner to determine whether the communication partner is set as a secret. It is confirmed whether or not (step S502).

  In step S502, whether or not there is data including the telephone number or e-mail address of the communication partner in the current communication in the communication partner data in which the secret flag registered in the phone book data of the memory 31 is set. To check.

  If the communication partner this time is a communication partner for which secret is set, the control unit 30 displays the secret screen displayed when communication is started (when a call is made or received or an e-mail is sent or received). Regardless of whether it is a screen, a normal screen, or a common screen, history data related to the current communication is stored in the memory 31 as secret state history data (step S503).

  On the other hand, if the communication partner of this time is not a communication partner set as a secret, the control unit 30 displays the screen displayed when communication is started (when a call is made or received or an e-mail is sent or received). Regardless of whether the screen is a secret screen, a normal screen, or a common screen, the history data related to the current communication is stored in the memory 31 as the normal state history data (step S504).

  As described above, in one embodiment of the present invention, a secret screen that is displayed only in the secret mode and a normal screen that is displayed only in the normal mode are displayed in a two-layer structure. Since the screen is configured to be managed, information leakage can be prevented only by switching to the normal mode, and the protection level of information that is not desired to be known by a third party can be improved.

  In the above-described embodiment, the standby screen is divided into two screens, that is, a secret standby screen a for making a transition to the secret screen and a normal standby screen i for making a transition to the normal screen. Since it is configured to be provided, it is possible to easily switch between the secret mode and the normal mode simply by switching between the secret standby screen a and the normal standby screen i.

  Therefore, when protecting information that you do not want to be disclosed to a third party, you only need to set the standby screen to the normal standby screen i. Management can be performed easily.

  In addition, the information displayed on the standby screen may include information that the third party does not want to be known, but in the above-described embodiment, the secret standby screen a is known to the third party. Even if information that you do not want to be displayed is displayed, the normal standby screen i is displayed in the normal mode, so the information displayed on the secret standby screen a is known to a third party. Can be prevented. Therefore, information that is not desired to be known by a third party (particularly information such as a schedule that is not desired to be known by a third party but is frequently confirmed) can be displayed on the standby screen a for secret.

  In addition, since switching from the secret mode to the normal mode is performed by a simple operation, the standby screen “a” for the secret is usually set, so that it is usually easy to lend it to a third party or leave the terminal 10. Can be switched to the standby screen i. Therefore, it is possible to prevent the information displayed on the standby screen a that is most frequently seen from being known to a third party.

  Further, if separate images are displayed on the secret standby screen a and the normal standby screen i, the user of the terminal 10 simply sees the standby screen and the current mode is the secret mode. Or not. On the other hand, it is possible to prevent a third party from recognizing the mode state. In this way, information about whether or not the secret mode is set is also prevented from being known to a third party.

  As described above, in one embodiment, the secret standby screen a is set as the initial screen for transition of the secret screen, and the standby screen i for normal use is set as the initial screen for transition of the normal screen. It is possible to prevent not only the book and history data but also the information displayed on the standby screen (the standby screen a for secrets) and the mode setting state from being known to a third party. The level of protection of information that the user does not want to be known can be improved.

  In the above-described embodiment, a secret screen that displays information including information that is not desired to be known by a third party and a normal screen that displays information that does not include information that is not desired to be known to a third party are used. The display screen is managed with a two-layer structure, but a predetermined category of information having confidentiality such as a business screen for displaying work-related information and a private screen for displaying private-related information is displayed. It is good also as a structure which manages a display screen by the structure of 3 or more layers also using a screen. Note that the secret screen in the above-described embodiment may be used as a business screen. If comprised as mentioned above, according to uses, such as public use and use, the screen of each hierarchy can be used properly.

  In the above-described embodiment, the mobile phone terminal 10 such as PDC (Personal Digital Cellular) or PHS (Personal Handyphone System) has been described as an example. However, other mobile communication terminals such as PDA (Personal Digital Assistants) are described. Of course, it can be applied to.

It is a block diagram which shows the example of a structure of the mobile telephone terminal in one embodiment of this invention. It is explanatory drawing which shows the example of data structures, such as telephone directory data stored in memory. FIG. 10 is a transition diagram of a display screen displayed on the LCD display unit of the mobile phone terminal according to the embodiment of the present invention. It is explanatory drawing which shows the example of the display state of the secret function setting screen for setting the function and password in a secret state. It is a flowchart which shows the example of the historical information registration process in one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mobile phone terminal 20 LCD display part 30 Control part 31 Memory 32 CPU
40 antenna 50 radio unit 60 operation unit 70 microphone 80 speaker

Claims (12)

A mobile communication terminal having a function of communicating with another communication terminal via a communication network,
An operation means for inputting information in accordance with a user operation;
Information storage means for identifying and storing user input information input by operating the operating means as secret information and non-secret information;
Screen display means for displaying a display screen;
Display control means for displaying a display screen on the screen display means;
A secret mode that allows display of the secret screen that displays the secret information stored in the information storage means on the screen display means in response to an instruction to switch to the secret mode by an operation of the operation means. And a secret mode setting means for setting to
The display control means includes
When the secret mode is set by the secret mode setting means, the secret screen is controlled to be displayed on the screen display means,
When the secret mode is not set, control is performed to display a non-secret screen that displays the non-secret information stored in the information storage unit and displays the same type of information as the secret screen. A mobile communication terminal characterized by the above. The secret screen includes a secret standby screen that is used as the initial screen when the secret mode is set.
The non-secret screen includes a non-secret standby screen that is used as an initial screen when the secret mode is not set.
The display control means
When there is a predetermined screen transition operation by the operating means while displaying the secret standby screen, perform control to transition to a secret screen other than the secret standby screen,
The control for transitioning to a non-secret screen other than the non-secret standby screen is performed when a predetermined transition operation is performed by an operation unit while the non-secret standby screen is displayed. Mobile communication terminal. The secret information and non-secret information stored in the information storage means include communication partner information for specifying other communication terminals that are communication partners,
When there is information input from another communication terminal, if the communication partner information of the other communication terminal is stored as the secret information in the information storage means, the information input from the other communication terminal The mobile communication terminal according to claim 1, further comprising: history storage means for storing history information regarding the information storage means as the secret information. Information input from another communication terminal is an incoming call from the other communication terminal,
The history storage means, when there is an incoming call from the other communication terminal, if the telephone number that is the communication partner information of the other communication terminal is stored as secret information in the information storage means, The mobile communication terminal according to claim 3, wherein incoming history information indicating that there is an incoming call from a number is stored in the information storage means as the secret information. Information input from another communication terminal is reception of an e-mail from the other communication terminal,
When the history storage means receives an e-mail from the other communication terminal, and the e-mail address that is the communication partner information of the other communication terminal is stored as secret information in the information storage means, the history storage means The mobile communication terminal according to claim 3, wherein reception history information indicating contents of reception of an e-mail from an e-mail address is stored in the information storage unit as the secret information. The mobile communication terminal according to any one of claims 1 to 5, wherein the secret information and the non-secret information stored in the information storage unit include schedule information indicating a user's schedule. A privacy protection method for preventing leakage of secret information stored in information storage means provided in a mobile communication terminal having a function of communicating with another communication terminal via a communication network,
User input information input by operating the operation means provided in the mobile communication terminal is identified as secret information and non-secret information and stored in the information storage means,
In response to an instruction to switch to the secret mode by an operation of the operation means, a secret screen for displaying the secret information stored in the information storage means is displayed on a screen display means provided in the mobile communication terminal. Set to incognito mode to allow display,
When the secret mode is set, control to display the secret screen on the screen display means,
When the secret mode is not set, control is performed to display a non-secret screen that displays the non-secret information stored in the information storage unit and displays the same type of information as the secret screen. A method for protecting privacy. The secret screen includes a secret standby screen that is used as the initial screen when the secret mode is set.
The non-secret screen includes a non-secret standby screen that is used as an initial screen when the secret mode is not set.
When there is a predetermined screen transition operation by the operating means while displaying the secret standby screen, perform control to transition to a secret screen other than the secret standby screen,
The control for transitioning to a non-secret screen other than the non-secret standby screen is performed when a predetermined transition operation is performed by an operation unit while the non-secret standby screen is being displayed. Privacy protection method. The secret information and non-secret information stored in the information storage means include communication partner information for specifying other communication terminals that are communication partners,
When there is information input from another communication terminal, if the communication partner information of the other communication terminal is stored as the secret information in the information storage means, the information input from the other communication terminal The privacy protection method according to claim 7 or 8, wherein the history information regarding the information is stored in the information storage unit as the secret information. Information input from another communication terminal is an incoming call from the other communication terminal,
When there is an incoming call from the other communication terminal, if the telephone number which is the communication partner information of the other communication terminal is stored in the information storage means as secret information, the incoming call from the telephone number is received. The privacy protection method according to claim 9, wherein incoming call history information indicating that there has been is stored in the information storage unit as the secret information. Information input from another communication terminal is reception of an e-mail from the other communication terminal,
When an e-mail is received from the other communication terminal, if an e-mail address that is communication partner information of the other communication terminal is stored in the information storage means as secret information, the e-mail address from the e-mail address The privacy protection method according to claim 9, wherein reception history information indicating reception contents of an electronic mail is stored in the information storage unit as the secret information. The privacy protection method according to any one of claims 7 to 11, wherein the secret information and the non-secret information stored in the information storage unit include schedule information indicating a user's schedule.

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