JP5370228B2 - Mobile terminal device, unlocking method and program - Google Patents

Description

  The present invention relates to a mobile terminal device, a lock release method, and a program.

In mobile terminal devices such as mobile phones, prevent unauthorized use of mobile terminal devices by others, protect data privacy by preventing data leaks such as phone book data and e-mails, and place them in bags or pockets. One method of preventing erroneous operation of keys when carrying is a method of restricting the use of functions of a portable terminal device. This restriction on the use of the functions of the mobile terminal device is called “lock”. As a method for unlocking the mobile terminal device, a method of performing password authentication such as a password is generally used.
Locking is an effective method for preventing unauthorized use of a mobile terminal device by others, but if you want to use the functions of the mobile terminal device quickly, such as when you want to make a call in an emergency, you will need to spend more time entering the password. In other words, there is a problem that a desired function cannot be used promptly. In addition, there is a problem that it is a burden on the user to perform the unlocking operation every time in order to use frequently used functions such as browsing received mail. Due to these problems, even a mobile terminal device having a lock function is often not locked, and there is a risk of unauthorized use of the mobile terminal device by another person, or a risk of data leakage, or There was a risk of misoperation when carrying.

Therefore, in Patent Document 1, in order to make it possible to use a function frequently used by a user without unlocking, a plurality of levels are provided in the lock function of the mobile phone, and a function that can be used for each level is set. A technique for setting the lock level by the user is shown.
Further, in Patent Document 2 and Patent Document 3, for the purpose of protecting privacy when a plurality of users share a mobile phone, the functions of the mobile phone or a part of the data is unlocked according to the input password. The technology that can be used is shown. By using this technology, functions that are frequently used and functions that are to be used quickly can be made available in advance.

Japanese Patent Laid-Open No. 2002-142010 JP 2005-244675 A JP 2009-17239 A

  However, if the techniques of Patent Documents 1 to 3 are used and functions that are frequently used or functions that are desired to be used quickly are excluded from lock targets, privacy protection may be insufficient. . For example, if the lock of the mail browsing function is released, there is a possibility that an e-mail may be peeped by another person while the mobile terminal device is placed on the desk and left for a short time.

  The present invention has been made in consideration of such circumstances, and its purpose is to reduce the burden of the user's unlocking operation when using a frequently used function, and to use the function quickly. An object of the present invention is to provide a portable terminal device that can protect the privacy while reducing the time required for the unlocking operation.

The present invention has been made to solve the above-described problem, and a mobile terminal device according to an aspect of the present invention receives a first character string input in a locked state that restricts the use of a plurality of functions or data. When the password authentication is successful, the state transits to an unlocked state in which all functions or data can be used, and in the locked state, a password is received upon receiving a second character string having fewer characters than the first character string. When the authentication is successful, the control unit transitions to a simple release state in which only a part of predetermined functions or data can be used, and in the state transition step, the simple release state is in the locked state. It is determined whether the function or data that can be used in the transition to is in a state where it can be used, and only when it is determined that it is in a state where it can be used, the transition to the simple release state And performing.

According to another aspect of the present invention, there is provided an unlocking method for a mobile terminal device, which is used for password authentication by receiving input of a first character string in a locked state that restricts the use of a plurality of functions or data. If successful, transition to an unlocked state in which all functions or data can be used, and in that locked state, a second character string having fewer characters than the first character string is received and password authentication is successful. A state transition step for transitioning to a simple release state in which only a part of predetermined functions or data can be used, and in the state transition step, in the locked state, the state is changed to the simple release state. It is determined whether the function or data that can be used in the transition is in a usable state, and the transition to the simple release state is performed only when it is determined that the function or data is in a usable state. And performing.

In addition, the program according to one aspect of the present invention may be configured so that when the password authentication is successful when the mobile terminal device receives the input of the first character string in a locked state that restricts the use of a plurality of functions or data, all functions are performed. Alternatively, when a password is successfully authenticated upon receiving an input of a second character string having a smaller number of characters than the first character string in the locked state, the state is changed to an unlocked state in which data can be used. A function that allows a state transition step to transit to a simple release state in which only a part of functions or data can be used is executed, and in the state transition step, a function that can be used in transition to the simple release state in the locked state or data to determine whether the conditions which may be utilized, if it is determined that the conditions which may be utilized alone, in a program for causing a transition to the simple release state That.

  ADVANTAGE OF THE INVENTION According to this invention, in the portable terminal device, the burden of the user's unlocking operation when using a frequently used function is reduced, and the time required for the unlocking operation of the function that the user wants to use quickly is reduced. , Can protect privacy.

It is a block diagram which shows schematic structure of the mobile telephone in one Embodiment of this invention. It is a figure which shows the state transition of the control part 202 in the embodiment. In the same embodiment, it is a figure which shows the example of the mode selection screen which the display part 201 displays, when there exists a new arrival unread mail. FIG. 6 is a diagram illustrating an example of a mode selection screen displayed by the display unit 201 when there is no newly arrived unread mail in the embodiment. In the embodiment, when unlocking is selected, it is a figure which shows the example of the cancellation | release code input screen which the display part 201 displays. In the embodiment, when simple cancellation | release is selected, it is a figure which shows the example of the simple code input screen which the display part 201 displays. 4 is a flowchart illustrating a processing procedure of a control unit 202 that transitions from a locked state to an unlocked state or a simple released state in the embodiment. 4 is a flowchart illustrating a processing procedure of a control unit 202 that transitions from a simple release state to a lock state or a lock release state in the embodiment. 6 is a flowchart illustrating a processing procedure of the control unit 202 that makes a transition from a locked state to an unlocked state or a simplified release state when a function that can always be used in the embodiment is a target of simple release. 6 is a flowchart illustrating a processing procedure of the control unit 202 that transitions from a simple release state to a lock state or a lock release state when a function that can always be used is a target of simple release in the embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram showing a schematic configuration of a mobile phone (mobile terminal device) according to an embodiment of the present invention. In the figure, the mobile phone 100 includes a display unit 201, a control unit 202, a wireless communication unit 203, a transmission / reception unit 204, a key operation unit 205, a storage unit 206, and a camera unit 207. The transmitter / receiver unit 204 includes a microphone 241 and a speaker 242. The key operation unit 205 includes a ten key 251, an enter key 252, and a direction key 253.

The display unit 201 includes a liquid crystal panel, reads image data selected by the control unit 202 from the storage unit 206, and displays an image based on the read image data.
The control unit 202 includes a mail function including a new unread mail browsing function, a call function between an outgoing call function and an incoming call function, a camera imaging function, a phone book browsing function (browsing of phone book data stored in the storage unit 206). Function) and web (web) browsing function. In addition, the control unit 202 restricts the use of these functions to the user. Further, the control unit 202 selects image data to be displayed on the display unit 201 from the image data stored in the storage unit 206 according to a function to be executed, a usage restriction situation, and the like, and indicates the selected image data. Information is output to the display unit 201. As information indicating the selected image data, for example, an identification number is assigned to each image data, and this identification number is used.
The control unit 202 is realized by reading and executing a program stored in a storage device built in the mobile phone 100 by a central processing unit (CPU) built in the mobile phone 100.

The wireless communication unit 203 transmits and receives data such as e-mail data when the mail function is executed, voice data when the call function is executed, and web data when the web browsing function is executed using a wireless signal.
The transmitter / receiver unit 204 inputs and outputs voices when performing a call function or browsing the web. The microphone 241 collects ambient sounds and converts them into audio data. The speaker 242 outputs sound according to the sound data output from the control unit 202.
The key operation unit 205 accepts an operation input by pressing a key. Specifically, the key operation unit 205 includes a numeric keypad 251 including numeric keys “0” to “9”, numeric input, alphabetic input, kana / kanji input, and an input mode switching key for switching full-width or half-width. And accepts input operations of numbers and characters. The key operation unit 205 includes a direction key 253 including a left key, a right key, an up key, and a down key, and accepts a selection operation such as item selection on the screen displayed on the display unit 201. The key operation unit 205 includes a determination key 252 and accepts confirmation operations such as confirmation of kana-kanji conversion when inputting kana-kanji and confirmation of an item selected on the screen displayed on the display unit 201.

The storage unit 206 includes a release code (first character string) and a simple code (second character string), which are passwords used by the control unit 202 to perform password authentication, mail data transmitted and received by the mail function, Various data such as book data (data in which a telephone number and a name are associated), image data displayed on the display unit 201, and image data captured by a camera imaging function are stored. The storage unit 206 is realized on a storage device built in the mobile phone 100.
The camera unit 207 is a camera used in the camera imaging function, converts incident light rays into image data, and outputs the image data to the control unit 202.

Next, functions or data usage restrictions performed by the control unit 202 on the user will be described.
FIG. 2 is a diagram illustrating state transition of the control unit 202.
The control unit 202 is one of a lock release state t1 in which the use of functions and data is not restricted, a lock state t2 in which user use of some functions or data is restricted, and a function or data restricted in the lock state t2. Is in any of the simple release states t3 in which the usage restrictions are released.

In the unlocked state t1, the functions and data usage of the mobile phone 100 are not restricted.
On the other hand, in the locked state t2, the use of the mail function, outgoing call function, telephone book browsing function, etc. is restricted, and the user can cancel the incoming call function, unlock the mobile phone 100, or turn off / on the mobile phone 100. Only some functions can be used. Note that the use of a part of the data may be restricted such that the telephone book browsing function can be used and a part of the telephone book data stored in the storage unit 206 cannot be browsed.
In the simple release state t3, the use restriction on the newly arrived unread mail browsing function is released from the functions restricted in the locked state. In addition, when all or part of the phone book data is not viewable in the locked state, for example, when the phone book data of a friend or the phone book data of a favorite store is not viewable, privacy protection The phone book data of a friend who has a relatively high need to remain is not viewable, and the phone book data of a favorite store with a relatively low need for privacy protection can be browsed. You may make it cancel.

In the unlocked state t1, for example, when the key operation unit 205 receives an operation input instructing a transition to the locked state t2, such as selecting a function or data lock on the function selection menu screen, the locked state t2 State transition r11 to is performed.
In the lock state t2, the user selects either the unlock mode or the unlock mode. When the unlock mode is selected by the user and the release code is input, the transition r12 to the unlock state t1 is performed. Hereinafter, the transition r12 from the locked state t2 to the unlocked state t1 is referred to as “unlocked”. On the other hand, when the simple release mode is selected and the simple code is input by the user in the lock state t2, the transition r21 to the simple release state t3 is performed. Hereinafter, the transition r21 from the lock state t2 to the simple release state t3 is referred to as “simple release”. A function or data that can be used by simple cancellation is referred to as “object of simple cancellation”.
In a simple release state t3, when a predetermined condition is satisfied, such as an operation input indicating the end of use of a function that has become available by simple release, a transition r22 to the lock state t2 is performed. On the other hand, in the simple release state t3, when unlocking is selected by the user and a release code is input, a transition r31 to the unlocked state t1 is performed.

Next, screens displayed on the display unit 201 upon simple release or lock release will be described with reference to FIGS.
FIG. 3 is a diagram illustrating an example of a mode selection screen displayed by the display unit 201 when there is a newly arrived unread mail. The mode selection screen is a screen for the user to select simple release or lock release.
In the example of FIG. 3, the mode selection screen includes an icon i31 indicating simple release and an icon i32 indicating unlock. The user uses the direction key 253 to select either the icon i31 indicating simple release or the icon i32 indicating lock release, and presses the enter key 252.
When the direction key 253 is pressed while the icon i31 indicating simple release is selected, simple release is selected. On the other hand, when the direction key 253 is pressed with the icon i32 indicating unlocking being selected, unlocking is selected.

FIG. 4 is a diagram illustrating an example of a mode selection screen displayed by the display unit 201 when there is no newly arrived unread mail. When there is no newly arrived unread mail, since there is no display target of the newly arrived unread mail browsing function, the newly arrived unread mail viewing function cannot be used. The mobile phone 100 is set so that the use restriction of the new unread mail browsing function cannot be canceled in advance by simple cancellation in a state where there is no new unread mail, and the display unit 201 displays an icon indicating unlocking. A mode selection screen that includes i42 but does not include an icon indicating simple release is displayed.
When the user presses the enter key 252 while the screen of FIG. 10 is displayed, unlocking is selected.
If there is no newly arrived unread mail, only unlocking can be selected, and the display unit 201 may display a cancellation code input screen described later without displaying the mode selection screen.
Note that when the mobile phone 100 receives mail while the mode selection screen in FIG. 4 is displayed, the new unread mail browsing function can be used, so the display unit 201 displays the simple cancel icon described in FIG. And a mode selection screen including an icon indicating unlocking.

  FIG. 5 is a diagram illustrating an example of a release code input screen displayed on the display unit 201 when unlocking is selected. The release code is a character string that the user inputs as a password when unlocking, and is set to have a larger number of characters than the simple code that is a character string that the user inputs as a password during simple release. In the example of FIG. 5, the release code is set as a character string of 8 characters such as “90197486”, for example, and the release code input screen includes an input field c51 for receiving input of 8 characters.

FIG. 6 is a diagram illustrating an example of a simple code input screen displayed on the display unit 201 when simple cancellation is selected. The simple code is a character string that the user inputs as a password at the time of simple release, and is set to a smaller number of characters than the release code that is a character string that the user enters as a password at the time of lock release. In the example of FIG. 6, the simple code is set as a character string of two characters such as “14”, for example, and the simple code input screen includes an input field c61 for accepting input of two characters.
As described above, since the simple code is set to have a smaller number of characters than the release code, the user can input the simple code faster than the input of the release code. Thereby, the use restriction of the function can be released more quickly, and the burden of the user's code input can be reduced.

Next, a processing procedure in which the control unit 202 performs state transition will be described with reference to FIGS. 7 and 8.
FIG. 7 is a flowchart illustrating a processing procedure of the control unit 202 in which the control unit 202 transitions from the locked state to the unlocked state or the simple released state. The control unit 202 starts the process of FIG.
In the process of FIG. 6, the control unit 202 first searches the storage unit 206 to determine whether there is a new unread mail (step S11). When it is determined that there is a newly arrived unread mail (step S11: YES), the image data of the mode selection screen including the icon indicating the simple release and the icon indicating the lock release is output to the display unit 201. The mode selection screen described in 3 is displayed. Thereafter, the control unit 202 waits for a mode selection operation by the user (step S12).

When the key operation unit 205 accepts a mode selection operation by the user (step S13), the control unit 202 determines which mode has been selected (step S14). When it is determined that the simple release mode is selected (step S14: YES), the control unit 202 selects and selects the simple code input screen described in FIG. 5 from the display screen data stored in the storage unit 206. Information indicating a simple code input screen is output to the display unit 201. The display unit 201 reads the image data of the simple code input screen from the storage unit 206, and displays the simple code input screen based on the read image data. Thereafter, the control unit 202 waits for a two-character code input by the user (step S15).
When the key operation unit 205 receives a two-character code input (step S16), the control unit 202 performs password authentication to determine whether or not the input code matches the simple code stored in the storage unit 206. This is performed (step S17). If it is determined that they match (step S17: YES), the control unit 202 transitions to the simple release state (step S18), and then ends the processing in FIG. On the other hand, if the control unit 202 determines in step S17 that the input code does not match the simple code stored in the storage unit 206 (step S17: NO), the process returns to step S11.

If it is determined in step S14 that the simple release mode has not been selected, that is, if it is determined that the lock release mode has been selected (step S14: NO), the control unit 202 displays the display stored in the storage unit 206. The cancellation code input screen described with reference to FIG. 6 is selected from the screen data, and information indicating the selected cancellation code input screen is output to the display unit 201. The display unit 201 reads the image data of the cancellation code input screen from the storage unit 206, and displays the cancellation code input screen based on the read image data. Thereafter, the control unit 202 waits for an 8-character code input by the user (step S21).
When the key operation unit 205 receives an 8-character code input (step S22), the control unit 202 performs password authentication to determine whether or not the input code matches the release code stored in the storage unit 206. This is performed (step S23). If it is determined that they match (step S23: YES), the control unit 202 transitions to the unlocked state (step S24), and then ends the processing in FIG. On the other hand, when the control unit 202 determines in step S23 that the input code does not match the release code stored in the storage unit 206 (step S23: NO), the process returns to step S11.
Even in the case where the control unit 202 determines that there is no newly arrived unread mail in step S11 (step S11: NO), the processing from step S21 is performed as in the case of step S14: NO.

FIG. 8 is a flowchart illustrating a processing procedure of the control unit 202 that transitions from the simple release state to the lock state or the lock release state. The control unit 202 starts the process shown in FIG.
In the process of FIG. 9, the control unit 202 first outputs information indicating the mail data of newly arrived unread mail, which is written in the storage unit 206 when mail arrives, to the display unit 201. The display unit 201 reads and displays the mail data of newly arrived unread mail from the storage unit 206 (step S31 above).
When there are a plurality of newly arrived unread mails, only the latest mail may be displayed in the simple release state, or all newly arrived unread mails may be displayed. If only the latest mail is displayed, it is possible to minimize information leakage when another person steals the mobile terminal device 100 in the simple release. On the other hand, if all newly arrived unread mails are displayed, the burden of the user entering a simple code for each mail can be eliminated.

  Next, the control unit 202 determines whether or not the key operation unit 205 has received an unlocking operation by the user (step S32). If it is determined that the unlocking operation has not been received (step S32: NO), the control unit 202 determines whether or not the lock condition is satisfied (step S33). Here, the “lock condition” is a condition predetermined as a condition for transition from the simple release state to the lock state. For example, pressing a predetermined button as a browse end button for newly arrived unread mail, maintaining a simple release state for a predetermined time, performing an operation of folding the mobile phone 100 main body while displaying newly arrived unread mail, etc. Is set in advance as a lock condition by the user. When it is determined that the lock condition is satisfied (step S33: YES), the control unit 202 shifts to the locked state (step S34), and thereafter ends the process of FIG. On the other hand, when it determines with the lock conditions not being satisfied in step S33 (step S33: NO), the control part 202 returns to step S32.

  If it is determined in step S32 that the unlock operation has been accepted (step S32: YES), the control unit 202 selects the release code input screen described in FIG. 6 from the display screen data stored in the storage unit 206. Information indicating the selected release code input screen is output to the display unit 201. The display unit 201 reads the image data of the cancellation code input screen from the storage unit 206, and displays the cancellation code input screen based on the read image data. Thereafter, the control unit 202 waits for an 8-character code input by the user (step S41). When the key operation unit 205 receives an 8-character code input (step S42), the control unit 202 performs password authentication to determine whether or not the input code matches the release code stored in the storage unit 206. This is performed (step S43). If it is determined that they match (step S43: YES), the control unit 202 transitions to the unlocked state (step S44), and then ends the processing of FIG. On the other hand, if the control unit 202 determines in step S43 that the input code does not match the release code stored in the storage unit 206 (step S43: NO), the process returns to step S31.

As described above, the mobile phone 100 allows the user to use a part of the functions by shifting to the simple release state by inputting a simple code having a smaller number of characters than the release code. By making it possible to use functions that are frequently used or functions that you want to use quickly by simple unlocking, users can use these functions by entering a code with a smaller number of characters. The time required for the unlocking operation can be shortened. In addition, since it is necessary to input a simple code to make these functions available, privacy can be protected. Furthermore, since it is necessary to input a release code with a larger number of characters in order to use a function that is not subject to simple release, it is possible to more strictly prevent unauthorized use of the mobile phone 100 by others and protect privacy.
Further, in step S11 of FIG. 7 , it is determined whether or not there is a newly arrived unread mail. Only when it is determined that there is a newly arrived unread mail, the newly unread mail browsing function can be simply canceled so It is determined whether the function or data that can be used is in a usable state, and only when it is determined that the function or data is in a usable state, the mobile phone 100 makes a transition to the simple release state. Therefore, it is possible to prevent the mobile phone 100 from being leaked by being used by another person while the mobile phone 100 is always set to the simple release state.
In addition, when the simple release state is maintained for a predetermined time, the mobile phone 100 shifts to the locked state, and thus the mobile phone 100 is used by another person in a state where the simple release state is maintained for a long time, and data leaks. Fear can be prevented.
The application range of the present invention is not limited to the above-described mobile phone. For example, it may be a portable terminal device having a plurality of functions such as a notebook having a mail function or a word processor function, or a portable terminal device storing a plurality of data.

In the above, the case where the function that becomes available due to the occurrence of a certain event is targeted for simple cancellation has been described by taking the newly arrived unread mail browsing function that can be used by receiving mail as an example. A function that can be used even if a specific event does not occur, such as an imaging function using the above (hereinafter referred to as “always available function”), may be a target of simple cancellation. In this case, the control unit 202 waits for selection of the release mode triggered by the transition to the locked state.
FIG. 9 is a flowchart illustrating a processing procedure of the control unit 202 that makes a transition from the locked state to the unlocked state or the simplified release state when a function that can always be used is a target of simple release. The control unit 202 starts the process of FIG.
In the process of FIG. 3, the control unit 202 first outputs image data of a mode selection screen including an icon indicating the simple release mode and an icon indicating the unlock mode to the display unit 201. The display unit 201 Display the mode selection screen described in. Thereafter, the control unit 202 waits for a mode selection operation by the user (step S51).

  Hereinafter, step S52 to step S56 are the same as step S14 to step S18 of FIG. 7, and step S61 to step S64 are the same as step S21 to step S24 of FIG. If the control unit 202 determines in step S55 that the input code does not match the simple code stored in the storage unit 206 (step S55: NO), and the input code is stored in the storage unit in step S63. If the control unit 202 determines that the release code stored in 206 does not match (step S63: NO), the process returns to step S51.

FIG. 10 is a flowchart illustrating a processing procedure of the control unit 202 that transitions from the simple release state to the lock state or the lock release state when a function that can always be used is a target of simple release. The control unit 202 starts the process shown in FIG.
In the process of FIG. 9, the control unit 202 first executes a camera imaging function that is a target of simple cancellation. Specifically, the control unit 202 outputs image data output from the camera unit 207 to the display unit 201, and the display unit 201 displays an image based on the image data output from the control unit 202. In addition, the control unit 202 determines whether or not the key operation unit 205 has received a press of a button assigned to the shutter button. If the control unit 202 determines that the button has been received, the control unit 202 displays an image output from the camera unit 207 as a captured image. Is written in the storage unit 206 (step S71). Note that, in the simple release state, the control unit 202 disables the function for confirming the captured data. Thereby, when the portable terminal device 100 in the simple release state is operated by another person, it is possible to prevent personal data from being leaked.

  Hereinafter, step S72 to step S74 are the same as step S32 to step S34 of FIG. 8, and step S81 to step S84 are the same as step S41 to step S44 of FIG. If it is determined in step S73 that the lock condition is not satisfied (step S73: NO), and if the input code does not match the release code stored in the storage unit 206 in step S83, the control unit When 202 determines (step S83: NO), it returns to step S71. In addition, for example, the user presses a predetermined button as an imaging function end button, maintains a simple release state for a predetermined time, or performs an operation of folding the mobile phone 100 main body while the imaging function is being executed. Are set in advance as a lock condition.

As described above, functions that can always be used can also be targeted for simple unlocking, and in the same manner as described above, when a function that can be used upon occurrence of a certain event is targeted for simple unlocking, the user can unlock it. The operation burden can be reduced, and the time required for the unlocking operation can be shortened. For example, it can be expected that the user can take an image without missing a photo opportunity by reducing the time required for the unlocking operation with the imaging function using the camera unit 207 as an object of simple release. Moreover, since it is necessary to input a simple code in order to use these functions, it is possible to prevent unauthorized use of the mobile phone 100 by others. Furthermore, since it is necessary to input a release code with a larger number of characters in order to use a function that is not subject to simple release, it is possible to more strictly prevent unauthorized use of the mobile phone 100 by others and protect privacy.
Further, as in the case where the function that can be used due to the occurrence of a certain event described above is targeted for simple release, if the simple release state is maintained for a predetermined time, the mobile phone 100 transitions to the locked state, It is possible to prevent the mobile phone 100 from being used by another person in a state where the simple release state is maintained for a long time, and the risk of data leakage.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

  The present invention is suitable for use in a mobile terminal device, a lock release method, and a program.

DESCRIPTION OF SYMBOLS 100 Mobile phone 201 Display part 202 Control part 203 Wireless communication part 204 Transmission / reception part 241 Microphone 242 Speaker 205 Key operation part 251 Numeric keypad 252 Enter key 253 Direction key 206 Storage part 207 Camera part

Claims (4)

When the password authentication is successful after receiving the input of the first character string in the locked state that restricts the use of a plurality of functions or data, the state transits to the unlocked state in which all functions or data can be used, and the lock In the state, when the password authentication is successful by receiving the input of the second character string having a smaller number of characters than the first character string, a simple release state in which only a part of predetermined functions or data can be used. A transition control unit ,
When the control unit determines whether the function or data that can be used in the transition to the simple release state is in a usable state in the locked state, and determines that the function or data is in a usable state Only, the mobile terminal device performs transition to the simple release state . The mobile terminal device according to claim 1, wherein the control unit transitions to the locked state when the simple release state is maintained for a predetermined time. A method for unlocking a mobile terminal device, comprising:
When the password authentication is successful after receiving the input of the first character string in the locked state that restricts the use of a plurality of functions or data, the state transits to the unlocked state in which all functions or data can be used, and the lock In the state, when the password authentication is successful by receiving the input of the second character string having a smaller number of characters than the first character string, a simple release state in which only a part of predetermined functions or data can be used. A transition state transition step ,
In the state transition step, it is determined whether the function or data that can be used in the transition to the simple release state is in a usable state in the locked state, and is determined to be in a usable state. Only in the case, a transition to the simple release state is performed . In mobile terminal device,
When the password authentication is successful after receiving the input of the first character string in the locked state that restricts the use of a plurality of functions or data, the state transits to the unlocked state in which all functions or data can be used, and the lock In the state, when the password authentication is successful by receiving the input of the second character string having a smaller number of characters than the first character string, a simple release state in which only a part of predetermined functions or data can be used. Execute the transition state transition step ,
In the state transition step, it is determined whether the function or data that can be used in the transition to the simple release state is in a usable state in the locked state, and is determined to be in a usable state. A program that makes a transition to the simple release state only in a case .

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