JP2013196628A - Terminal and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent other people from easily canceling a function unusable state when a terminal is in the function unusable state such as a screen lock state.SOLUTION: A portable terminal 10 comprises: a touch panel 11; a display unit 12 which displays and moves a candidate of cancellation information on the touch panel 11 in a screen lock state in which predetermined functions are unusable; a position input unit 13 which inputs positional information indicating a position on the touch panel 11; a cancellation information input unit 14 which inputs the cancellation information according to the position indicated by the positional information and the position of the candidate at the time when the positional information is input; a determination unit 15 which determines whether the cancellation information satisfies a pre-registered condition; and a screen lock control unit 16 which cancels the screen lock state according to the determination.

Description

  The present invention relates to a terminal including a display device and a control method using the terminal.

  In a portable terminal equipped with a touch panel such as a smartphone, when it is not operated for a certain period of time or when the user presses a designation button, the screen is locked for the purpose of ensuring security. The screen lock state is a state in which input from the touch panel is prohibited unless unlocked by a preset operation.

  As a method for unlocking, there is a method in which the finger is traced on the touch panel and unlocked when the trace traced with the finger matches a predetermined pattern (pre-registered trace) (see, for example, Patent Document 1). . Alternatively, a personal identification number (PIN: Personal Identification Number) or a password may be unlocked by inputting an input candidate displayed on the screen by touching it with a finger.

JP 2007-257140 A

  However, in the above-described method of tracing the touch panel with a finger, the trace of the finger traced on the touch panel may remain after unlocking. Also, when a personal identification number or password is input, a fingerprint or the like may remain at a specific position corresponding to the information input on the touch panel after unlocking. In that case, it becomes possible for another person to easily guess the registered pattern and release the screen lock by looking at the trace of the finger on the screen.

  The present invention has been made in view of the above, and when a terminal is in a function unavailable state such as a screen lock state, a terminal capable of preventing others from easily releasing the function unavailable state and An object is to provide a control method.

  In order to achieve the above object, a terminal according to the present invention is a terminal provided with a display device, and is released on the display screen of the display device in a function unusable state in which a predetermined function of the terminal cannot be used. Display means for displaying information candidates while being moved, position input means for inputting position information indicating the position on the display screen, a position indicated by the position information input by the input means, and the position information are input. The release information input means for inputting the release information and the release information input by the release information input means satisfy the pre-registered condition according to the position of the candidate displayed by the display means at the same timing. A determination means for determining whether or not the information for cancellation satisfies the condition, and an unusable state cancellation means for enabling the use of a predetermined function when the determination information satisfies the condition. That.

  In the terminal according to the present invention, in a function unusable state in which the predetermined function of the terminal is not available, a candidate for information for release is displayed on the screen display of the display device for processing to make the predetermined function available. Displayed while moving. As processing for making a predetermined function available, position information indicating a position on the display screen is input, and release information is input in accordance with the position and the position at the timing when the position information is input. The predetermined function can be used according to the release information. As described above, in the terminal according to the present invention, since the candidates for the release information such as the personal identification number and the password are displayed while being moved, it is assumed that a specific position on the display screen is designated for inputting the release information. However, the release information is not easily known or inferred by others. Alternatively, since a different position can be designated every time the function unavailable state is released, the release information that can be released is not easily known or inferred by others. Thus, according to the present invention, when the terminal is in a function unavailable state such as a screen lock state, it is possible to prevent others from easily releasing the function unavailable state.

  The display means may input information indicating at least one of the direction and speed of moving the candidate, and move the candidate based on the input information. According to this structure, it can be set as the movement which makes it easy for a user to input the information for cancellation | release, and a user's convenience can be improved.

  The display means displays a plurality of characters while moving as candidates for release information, the release information input means inputs a character string of one or more characters as release information, and the determination means inputs release information. It may be possible to determine whether or not the release information satisfies the condition by determining whether or not the release information input by the means matches a registered character string of one or more characters registered in advance. . According to this configuration, the present invention can be implemented more reliably.

  The display means may display characters other than the characters included in the registered character string as candidates for release information. According to this configuration, it is difficult to make the release information known or inferred by others, and security when releasing the function unavailable state can be improved.

  The display means may display characters of different colors as candidates for the release information. According to this configuration, since a color element is added to the characters of the release information, it is easy for the user to store the release information such as a personal identification number and password, and the release information is known or analogized by others. The security at the time of canceling the function unavailable state can be improved.

  By the way, the present invention can be described as the invention of the terminal as described above, and can also be described as the invention of the control method as follows. This is substantially the same invention only in different categories, and has the same operations and effects.

  That is, the control method according to the present invention is a control method by a terminal provided with a display device, and in a function unusable state in which a predetermined function of the terminal cannot be used, the release information is displayed on the display screen of the display device. A display step for displaying a candidate while moving, a position input step for inputting position information indicating a position on the display screen, a position indicated by the position information input in the input step, and a timing at which the position information is input According to the position of the candidate displayed in the display step, it is determined whether the release information input step for inputting the release information and the release information input in the release information input step satisfy a pre-registered condition. A predetermined function can be used when it is determined in the determination step that the release information satisfies the conditions in the determination step. Including the unavailable state release step, the.

  According to the present invention, since the unlocking information such as the password or password is not easily known or inferred by another person, when the terminal is in a function unavailable state such as a screen lock state, It is possible to prevent the function unavailable state from being easily released.

It is a figure which shows the function structure of the portable terminal which is a terminal which concerns on embodiment of this invention. It is a figure which shows the example of a display of the display screen of a touchscreen at the time of canceling | releaseing a screen lock in a portable terminal. It is a figure which shows the example of a display of the display screen of a touchscreen at the time of registering the registration character string for canceling | releaseing a screen lock in a portable terminal. It is a figure which shows the hardware constitutions of the portable terminal which is a terminal which concerns on embodiment of this invention. It is a flowchart figure which shows the process (control method) performed when registering the registration character string for canceling | releaseing screen lock with the portable terminal which is a terminal which concerns on embodiment of this invention. It is a flowchart figure which shows the process (control method) performed when releasing a screen lock with the portable terminal which is a terminal which concerns on embodiment of this invention.

  Hereinafter, embodiments of a terminal and a control method according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 shows a mobile terminal 10 according to the present embodiment. The mobile terminal 10 is a device that is carried (possessed) by a user, and is, for example, a mobile phone such as a smartphone. The mobile terminal 10 has various functions. For example, the portable terminal 10 has a touch panel as will be described later, and has a function of inputting information from the touch panel and outputting information from the touch panel.

  The mobile terminal 10 has a screen lock function. The screen lock function is to place the mobile terminal 10 in the screen lock state (screen lock) when the mobile terminal 10 is not operated for a certain period of time or when the user performs a specific operation on the mobile terminal 10. It is a function. The screen lock state is a function unusable state in which a predetermined function of the mobile terminal 10 is unusable. The predetermined function that cannot be used is, for example, a function that performs input / output from a touch panel. That is, the screen lock state is a state in which various functions (except for the function for releasing the screen lock state) that are used by tapping the touch panel are unavailable. The screen lock function is, for example, for preventing a third party other than the user from operating the mobile terminal 10 without permission. In the present embodiment, the function for controlling availability is a function related to the screen lock state.

  In addition, when the portable terminal 10 is in a screen lock state, it is also possible to enter a sleep mode in order to reduce power consumption. The sleep mode is a mode that suppresses power consumption without performing screen display on a touch panel (liquid crystal display). Note that since power is supplied to the memory even in the sleep mode, the data being executed before the sleep mode is held even during the sleep mode. Further, the hibernation mode may be one in which the application is put into a hibernation state.

  Here, functions of the mobile terminal 10 according to the present embodiment will be described. As shown in FIG. 1, the mobile terminal 10 includes a touch panel 11, a display unit 12, a position input unit 13, a release information input unit 14, a determination unit 15, and a screen lock control unit 16. The In addition, although the portable terminal 10 is also provided with the function as a mobile phone or a smart phone, for example, since it is the same as that of the conventional mobile phone and a smart phone, description is abbreviate | omitted.

  The touch panel 11 is a display device that displays input information on a display screen. The touch panel 11 is also an input device that receives input from the user. The touch panel 11 detects a change in capacitance or voltage caused by a user's finger or the like touching or approaching the display screen, and performs input based on these changes. Note that the touch panel 11 may have the same configuration as the conventional one.

  The display unit 12 is a display unit that displays candidates for information for release on the display screen of the touch panel 11 in the screen lock state. The release information is information input to release the screen lock state, and is, for example, a character string of one or more characters. As the characters used as the release information, for example, arbitrary symbols that can be displayed on the display screen of the touch panel 11 such as English letters, numbers, and pictograms can be used. The display unit 12 displays a plurality of characters as moving information candidates while moving them. For example, as shown in FIG. 2A, each character 20 is scrolled from the left side to the right side (in the telop format) in the state shown in FIG. 2A on the display screen 11a.

  Moreover, it is good also as changing as if the character 20 of each position is moved besides scrolling. For example, in the case shown in FIG. 2A, the characters at each position are sequentially displayed in the order of A, D, C, B, A, etc., so that they appear to flow from the left side to the right side. Also good.

  As will be described later, the user inputs one or more displayed cancellation information candidates by sequentially selecting them, and inputs the cancellation information as a character string. If the input release information is a registered character string that is a correct character string, the screen lock state is released, and the display screen 11a immediately before the screen lock state is entered as shown in FIG. The screen is displayed, and the function that has been disabled by the screen lock function can be used.

  The display unit 12 may display characters other than the characters included in the registered character string as candidates for release information. That is, it is not necessary for the registered character string to use all the characters displayed as candidates for the release information. The display part 12 is good also as displaying the character of a mutually different color as a candidate of the information for cancellation | release. For example, as shown in FIG. 2A, characters A, B, C, and D are displayed in different colors as candidates for release information (as shown in FIG. 2A, red, yellow, It is also possible to display characters on circles of green and blue colors). In this case, characters of different colors are recognized as different characters.

  As shown in FIG. 2A, the character may be moved not only in the direction from the left side to the right side (the direction indicated by the arrow 30a in FIG. 2C) but also in another method. For example, the direction from the right side to the left side (the direction indicated by the arrow 30b in FIG. 2C), the direction from the upper side to the lower side (the direction indicated by the arrow 30c in FIG. 2C), and the lower side to the lower side. It is good also as moving toward any of the direction (direction shown by the arrow 30d of FIG.2 (c)). Further, the direction of movement may be sequentially changed according to time.

  The display part 12 is good also as inputting the information which shows the direction and speed which move a character, and moving a character based on the input information. This input is performed, for example, by an operation on the touch panel 11 of the user's mobile terminal 10. For the moving direction, for example, information indicating the moving direction indicated by each arrow 30 in FIG. 2C is input (the user may select any direction). As for the moving speed, information options indicating the speed such as “slow” and “fast” are presented to the user, and information indicating the selected speed is input. The display unit 12 moves the characters at the direction and speed indicated by the information input as described above. Further, it is not always necessary to input both the direction and the speed, and either one may be input, and either one may be set in advance.

  When the mobile terminal 10 is in the screen lock state, the display unit 12 starts releasing the screen lock such as a specific key provided on the mobile terminal 10 being pressed by the user or the touch panel 11 being tapped. The operation to do is detected. When the display unit 12 detects the operation, the display unit 12 performs the above display.

  The position input unit 13 is position input means for inputting position information indicating a position on the display screen 11 a of the touch panel 11. When characters are displayed on the display screen 11a of the touch panel 11 by the display unit 12, the user has displayed the characters on the display screen 11a of the touch panel 11 in order to input the characters displayed on the display screen 11a. Tap a location. The touch panel 11 detects the tapped location and outputs information indicating the location to the position input unit 13. The information indicating the location tapped by the user is, for example, coordinates on the display screen 11a. That is, the position input unit 13 inputs coordinate information on the display screen 11a as the position information. The position input unit 13 outputs the position information to the release required information input unit 14.

  The cancellation required information input unit 14 is displayed on the display unit 12 at the position indicated by the position information input by the position input unit 13 and the timing at which the position information is input (timing when a tap on the touch panel 11 is detected). This is a release information input means for inputting release information according to the position of the character being read. Specifically, the cancellation necessity information input unit 14 detects the character displayed by the display unit 12 at the position indicated by the position information at the timing when the position information is input, and inputs it as the release information.

  Input of position information by the position input unit 13 (that is, user tap) is repeatedly performed for the number of characters of the registered character string, and the release-necessary information input unit 14 is information for release every time position information is input by the position input unit 13. Enter. That is, the position input unit 13 inputs release information for the number of characters in the registered character string. Note that the number of characters in the registered character string is stored in advance in the cancellation requirement information input unit 14. In addition, when the registered character string fluctuates due to user registration, the number of characters in the registered character string is notified from the determination unit 15 in advance. The cancellation necessity information input unit 14 outputs to the determination unit 15 character strings arranged in the input order, which are cancellation information for the number of characters of the input registered character string.

  The determination unit 15 is a determination unit that determines whether the release information input from the release required information input unit 14 satisfies a pre-registered condition. Specifically, the determination unit 15 determines whether or not the character string that is the cancellation information input from the cancellation necessity information input unit 14 matches the registered character string registered in advance. It is determined whether the release information satisfies the condition. The registered character string is a character string of one character or more. The determination unit 15 notifies the screen lock control unit 16 whether or not the release information matches the registered character string.

  The determination unit 15 can register (store) a registered character string to be compared with the release information by an input from the user. Registration is performed as follows, for example. First, as illustrated in FIG. 3A, the determination unit 15 performs display for setting unlocking on the display screen 11 a of the touch panel 11. Therefore, when the “timing” at which the unlocking is performed by the function according to the present embodiment is selected, an input related to the selection is accepted, and subsequently, the display screen 11 a of the touch panel 11 is displayed as shown in FIG. Characters that are candidates for the registered character string for registering the registered character string are displayed. This display is performed by, for example, a setting function (for example, “security setting”, “screen lock”, “timing lock screen” as the screen transition) of the mobile terminal 10 main body). The characters displayed here are the same as the candidates for release information displayed on the display screen 11 a of the touch panel 11 by the display unit 12. However, in this display, it is not necessary to move each character.

  Subsequently, the determination unit 15 detects a tapped location on the display screen 11a of the touch panel 11 by the user (this detection is the same as the function of the position input unit 13) and displays the tapped location. The registered character is used as a registered character string. The input of the registered character string is repeated until the number of characters reaches a preset number, and the character string arranged in the input order becomes the registered character string. For example, a four character string is a registered character string. Note that the number of registered character strings may be a number set by the user instead of the specified number. In that case, the determination unit 15 notifies the number of characters in the registered character string to the cancellation necessity information input unit 14. In the registration of the registered character string and the comparison with the release information by the determination unit 15, different characters may be recognized as different characters. In addition, at the time of registration, a character string used as a registered character string and release information may be selected from any one of English characters (alphabet), numbers, and pictograms. In this case, for example, a number is set as a default.

  In addition to the above, a registered character string may be set (registered). For example, a registered character string may be input using a key provided in the mobile terminal 10. Further, when setting the registered character string, registration of the direction and speed of moving the character by the display unit 12 may be performed together.

  The screen lock control unit 16 is means for controlling the screen lock function. The screen lock control unit 16 detects that the mobile terminal 10 has not been operated for a certain period of time, or receives a press of a button for locking the screen of a key provided on the touch panel 11 or the mobile terminal 10 by the user. The mobile terminal 10 is set to a screen lock state (pause mode).

  Further, when the mobile terminal 10 is in the screen lock state, the screen lock control unit 16 is notified from the determination unit 15 that the release information and the registered character string match, that is, the release information. Is in an unusable state releasing means for releasing the screen lock state when it is notified that the condition for releasing the screen lock is satisfied. When the screen lock state is released, as described above, the function that has been disabled due to the screen lock state can be used.

  On the other hand, when the mobile terminal 10 is in the screen lock state, the screen lock control unit 16 releases the screen lock state when the determination unit 15 notifies that the release information and the registered character string do not match. do not do. In that case, the screen lock control unit 16 displays on the display screen 11a of the touch panel 11 that the screen lock is not released, and the display unit 12 again releases the screen lock as shown in FIG. Such a display may be displayed. In addition, the screen lock control unit 16 may not shift to the unlock mode with the password registered in the mobile terminal 10 or try to unlock for a certain time when the screen unlock has failed a certain number of times. It may be possible to prevent other people from trying to unlock the device many times by taking measures such as being taken.

  Subsequently, FIG. 4 shows a hardware configuration of the mobile terminal 10 according to the present embodiment. As shown in FIG. 4, the mobile terminal 10 includes hardware such as a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102, a ROM (Read Only Memory) 103, a mobile communication module 104, and an antenna 105. ing. In addition, the mobile terminal 10 includes the touch panel 11 as hardware as described above. The functions described above are exhibited when these components are operated by a program or the like. The above is the configuration of the mobile terminal 10.

  Subsequently, a control method, which is a process executed by the mobile terminal 10 according to the present embodiment, will be described using the flowcharts of FIGS. 5 and 6. First, processing executed when registering a registered character string for releasing the screen lock will be described with reference to the flowchart of FIG. This process is triggered by the user performing the above registration operation on the mobile terminal 10.

  In the mobile terminal 10, the determination unit 15 becomes a registered character string candidate for registering the registered character string on the display screen 11 a of the touch panel 11 via the menu screen as shown in FIG. Characters are displayed. Subsequently, the determination unit 15 detects a user tap on the touch panel 11 and inputs a registered character string. For example, four characters that are combinations of colors and English characters are input. The character string input in this way is set as a registered character string and registered (stored) in the determination unit 15 (S01).

  Subsequently, the display unit 12 inputs information indicating the direction and speed of moving the character as a candidate for the release information. The input of these pieces of information is performed by detecting a user operation on the touch panel 11 or the like. Based on the input information, the direction and speed for moving the character by the display unit 12 are set (S02). The moving direction and speed of the characters do not necessarily need to be set. For example, as a default, the moving direction is “direction from left to right” and the speed is “slow”. The above is the processing executed when registering the registered character string for releasing the screen lock.

  Next, a process for releasing the screen lock state when the mobile terminal 10 is in the screen lock state will be described using the flowchart of FIG. This process is performed when the display unit 12 detects an operation for starting the release of the screen lock.

  When the above detection is made, the display unit 12 performs a display (timing lock screen) for releasing the screen lock on the display screen 11a of the touch panel 11 (S11, display step). In this display, for example, four English characters (16 characters) of four different colors are displayed as shown in FIG. In this display, for example, characters that are candidates for the displayed release information are moved. This display of characters is continuously performed in the following processing.

  Subsequently, position information indicating a position on the display screen 11a of the touch panel 11 is input by the position input unit 13 (S12, position input step). The input of the position information is performed using a tap on the display screen 11a of the touch panel 11 by the user as a trigger. The input position information is output from the position input unit 13 to the release required information input unit 14.

  Subsequently, the character displayed on the display unit 12 is detected at the position indicated by the position information at the timing when the position information is input by the cancellation necessity information input unit 14 and is input (specified) as information for cancellation. (S13, release information input step). Subsequently, the cancellation necessity information input unit 14 determines whether or not the number of input characters is equal to the number of registered characters (S14). For example, when the number of characters in the registered character string is 4, it is determined whether 4 characters have been input as the release information.

  If the number of characters input is not the number of characters in the registered character string (NO in S14), position information is input again by the position input unit 13, and the above processing (S12 to S14) is repeated. It is. If the number of characters input is the number of characters in the registered character string (YES in S14), the character string arranged in the order in which the input characters are input is determined from the cancellation required information input unit 14 by the determination unit. 15 is output.

  Note that the end of the input of the character string by the cancellation necessity information input unit 14 may be ended by accepting an operation to end the input of the character string from the user in addition to the determination by the number of characters as described above. In this case, the user must memorize the number of characters in the registered character string, and the security can be further improved.

  Subsequently, the determination unit 15 determines whether or not the character string that is the information for cancellation input from the cancellation required information input unit 14 matches the registered character string registered in advance (S15, determination step). ). The determination result is notified from the determination unit 15 to the screen lock control unit 16. When it is determined that the release information matches the registered character string (YES in S15), the screen lock control unit 16 releases the screen lock (S16, unusable state release step), and FIG. As shown in b), the function that has been disabled by the screen lock can be used.

  If it is determined that the release information does not match the registered character string (NO in S15), the screen lock state is not released. In that case, the screen lock control unit 16 displays that the screen lock is not released (S17). Subsequently, the display unit 12 again displays as shown in FIG. 2A for releasing the screen lock (S11), and the subsequent processing is repeated. If the screen lock release fails a certain number of times, the screen lock control unit 16 cannot shift to the password release mode registered in the mobile terminal 10 or try to unlock for a certain period of time. And other measures are taken. The above is the processing for releasing the screen lock state when the mobile terminal 10 is in the screen lock state.

  As described above, in the present embodiment, since the candidates for the release information such as the personal identification number and password are displayed while being moved, even if a specific position on the display screen is designated to input the release information, The release information is not easily known or inferred by others. For example, even if a finger mark remains at a specific position on the display screen 11a of the touch panel 11, the registered character string cannot be specified from the mark because the candidate for the release information is displayed while being moved. Alternatively, since a different position can be designated every time the lock is released, the registered character string is not easily known or inferred by others. Thereby, according to this embodiment, when the portable terminal 10 is in a function unavailable state such as a screen lock state, it is possible to prevent others from easily releasing the function unavailable state.

  Further, as in the present embodiment, the direction and speed for moving the candidate for information for release may be set. According to this structure, it can be set as the movement which makes it easy for a user to input the information for cancellation | release, and a user's convenience can be improved.

  In addition, as in this embodiment, characters that are not included in the registered character string may be displayed as candidates for the release information. According to this configuration, it is possible to improve the security when releasing the screen lock state by making it difficult for others to know or analogize the release information.

  Moreover, it is good also as using the character with a color as information for cancellation | release and a registration character string like this embodiment. According to this configuration, since a color element is added to the characters of the release information, it is easy for the user to store the release information such as a personal identification number and password, and the release information is known or analogized by others. It is difficult to improve security when releasing the screen lock state.

  In the present embodiment, the portable terminal 10 such as a smartphone has been described as an example. However, the present invention is not necessarily related only to the portable terminal, and is realized by an arbitrary terminal having a function similar to the screen lock as described above. can do. For example, the present invention may be realized by a PC (Personal Computer).

  For example, the touch panel 11 is exemplified as the display device, but the display device is not limited to this, and any display device can be used as long as it can display the release information candidates while moving them. Further, the position information need not be input from the touch panel 11, and may be performed by using a cursor displayed on the display screen using an operation unit other than the touch panel 11.

  In addition, the screen lock during the sleep mode is exemplified as the function unavailable state, but is not limited to this, and includes all previous states for making a specific function available, For example, a password input waiting state that requires input when starting to use a specific application is also included in the function unavailable state.

DESCRIPTION OF SYMBOLS 10 ... Portable terminal, 11 ... Touch panel, 12 ... Display part, 13 ... Position input part, 14 ... Release information input part, 15 ... Judgment part, 16 ... Screen lock control part, 101 ... CPU, 102 ... RAM, 103 ... ROM, 104 ... mobile communication module, 105 ... antenna.

Claims (6)

A terminal comprising a display device,
Display means for displaying a candidate for the information for release while moving on the display screen of the display device in a function unusable state in which the predetermined function of the terminal is unusable;
Position input means for inputting position information indicating the position on the display screen;
Release information for inputting the release information according to the position indicated by the position information input by the input means and the position of the candidate displayed by the display means at the timing when the position information is input. Input means;
Determining means for determining whether the release information input by the release information input means satisfies a pre-registered condition;
An unusable state releasing unit that enables the predetermined function when the determining unit determines that the release information satisfies the condition;
A terminal equipped with.   The terminal according to claim 1, wherein the display unit inputs information indicating at least one of a direction and a speed in which the candidate is moved, and moves the candidate based on the input information. The display means displays a plurality of characters as the candidate for the release information while moving,
The release information input means inputs a character string of one or more characters as the release information,
The determination means determines whether the release information input by the release information input means matches one or more registered character strings registered in advance, so that the release information is Determine if the condition is met,
The terminal according to claim 1 or 2.   The terminal according to claim 3, wherein the display unit also displays characters other than characters included in the registered character string as candidates for the release information.   The terminal according to claim 3 or 4, wherein the display unit displays characters of different colors as candidates for the release information. A control method by a terminal including a display device,
A display step of displaying a candidate for the release information while moving it on the display screen of the display device in a function unusable state in which the predetermined function of the terminal is unusable;
A position input step for inputting position information indicating a position on the display screen;
Release information for inputting the release information according to the position indicated by the position information input in the input step, and the position of the candidate displayed in the display step at the timing when the position information is input An input step;
A determination step for determining whether or not the release information input in the release information input step satisfies a pre-registered condition;
An unusable state releasing step of making the predetermined function available when it is determined that the releasing information satisfies the condition in the determining step;
Control method.

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