JP4786167B2 - Information processing apparatus and display control method thereof - Google Patents

Description

  The present invention relates to an information processing apparatus and a display control method therefor, and more particularly, to an information processing apparatus that controls a screen saver execution waiting time and a display control method therefor.

  2. Description of the Related Art Conventionally, in display screen control of an information processing apparatus or the like, screen saver control for automatically darkening a screen or displaying a predetermined animation image when the same screen is displayed for a predetermined time or longer is performed.

  The original purpose of the screen saver control was to prevent the burn-in phenomenon of the CRT (Cathode Ray Tube) screen. The burn-in phenomenon is a phenomenon in which the displayed characters and images remain on the CRT screen even after the power is turned off if the same screen is displayed on a CRT (Cathode Ray Tube) for a long time. Say.

  In recent years, the meaning of the original purpose of preventing the burn-in phenomenon has been fading since the performance improvement of CRT and the tendency of many display devices to shift from CRT to liquid crystal display devices.

However, many of the screen saver controls have an optional function of requesting a password when the screen saver control is ended and the original screen is restored. If this function is used, for example, when a legitimate user of the information processing apparatus automatically shifts to the screen saver screen after leaving the seat, a third party who does not know the password cannot return to the original screen from the screen saver screen Thus, it can be used as an effective means for security management. Thus, even if the original purpose of preventing burn-in is diminished, the screen saver control will continue to be maintained as an effective means for security. .

  On the other hand, the screen saver control is a control for automatically switching to the screen saver screen when the user does not operate the keyboard or the like for a predetermined time (hereinafter, this predetermined time is referred to as a screen saver execution waiting time). It may be complicated in operation. While thinking while looking at a certain display screen, the screen is suddenly switched to a screen saver screen, and an unnecessary operation is forced to return to the original screen, so that thinking is interrupted and work efficiency is lowered.

  In order to avoid such an inconvenience, for example, Patent Documents 1 and 2 disclose techniques relating to improvement of screen saver control.

  The technology disclosed in Patent Document 1 monitors the time during which the screen saver screen is maintained. For example, when the user operates an arbitrary keyboard immediately after shifting to the screen saver screen, the screen is restored to the original screen. From the next time, the screen saver execution waiting time is variably controlled, for example, by increasing the screen saver execution waiting time. As a result, an appropriate transition time to the screen saver screen is set according to the user's work situation.

Further, the technology disclosed in Patent Document 2 allows a screen saver execution waiting time to be set in advance for each application software, and when specific application software is opened, it is different from the normally set transition time to the screen saver screen. This is a technology that allows transition to a screen saver screen in transition time.
JP 2000-20204 A JP 2000-163034 A

  As described above, the main purpose of screen saver control has shifted from the purpose of preventing screen burn-in to the purpose of security.

  A user of an information processing apparatus usually performs various operations using the information processing apparatus. Some of these tasks do not require security, while others require high security. Even when the same application software is used, security may or may not be necessary depending on the type of data or document to be worked on.

  The screen saver control provided by a commonly used OS (Operating System) has optional setting functions such as an optional setting function for the screen saver execution waiting time and a security setting function for recovery from a screen saver screen using a password. These option setting functions are uniformly applied to all application software that operates in the system.

  The screen saver control functions disclosed in Patent Documents 1 and 2 are intended to alleviate inconvenience in the operation of the user, and are not intended to improve the screen saver control function from the viewpoint of security. .

  Further, the technology disclosed in Patent Document 2 enables setting of a screen saver execution waiting time for each application software, but the screen saver execution waiting time according to the security level of data and document types in the same application software. Cannot be changed.

  For this reason, if the screen saver execution waiting time is set to be short in correspondence with data or documents with a high security level, there is a problem that even when normal data or documents are handled, the screen saver screen is frequently shifted.

  The present invention has been made in view of the above circumstances, and controls the screen saver execution waiting time according to the work target such as data and documents handled by the information processing apparatus, and maintains high operability for a low-security work target. However, it is an object of the present invention to provide an information processing apparatus and a display control method thereof that can ensure high confidentiality for a work object with high security.

In order to solve the above problems, an information processing apparatus according to the present invention is an information processing apparatus including a display that displays various types of information . When the information processing apparatus is not operated for a predetermined time, the display A secret information discriminating unit for discriminating whether or not the display information displayed on the display device includes confidential information in an information processing apparatus having screen saver means for automatically switching the displayed information display screen to a screen saver screen; A display time control unit that shortens the predetermined time when the display information includes confidential information, and a display unit that is provided separately from the display, and the confidential information determination unit includes the predetermined information. When the time is shortened, a display to that effect is displayed on at least one of the display unit and the display unit .

A display control method for an information processing apparatus according to the present invention is an information processing apparatus including a display that displays various types of information and a display unit that is provided separately from the display. In a display control method of an information processing apparatus having a screen saver means for automatically switching an information display screen displayed on the display to a screen saver screen when it is not operated for a predetermined time, display information displayed on the display It is determined whether or not confidential information is included, and when the display information includes confidential information, the predetermined time is shortened, and when the predetermined time is shortened, a display indicating the fact is displayed. And displaying on at least one of the display unit and the display unit .

  According to the information processing apparatus and the display control method thereof according to the present invention, the screen saver execution waiting time is controlled according to the work target such as data and documents handled by the information processing apparatus, and high operation is performed for a low security work target. It is possible to ensure high confidentiality for work objects with high security, while maintaining security.

  Embodiments of an information processing apparatus and a display control method thereof according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a diagram showing an appearance of an embodiment of an information processing apparatus 1 according to the present invention.

  For example, an information processing apparatus 1 typified by a personal computer or the like includes an information processing apparatus main body 2 having a thin rectangular shape, and a panel unit 3 connected to the information processing apparatus main body 2 so as to be freely opened and closed.

  On the inner surface of the panel unit 3, a display 4 composed of, for example, an LCD (Liquid Crystal Display) or the like is provided.

  On the upper surface of the information processing apparatus main body 2, a keyboard 5 for inputting various kinds of information and a pointing device 8 for instructing a specific position on the display 4 are arranged.

  A power switch 6 for starting up the information processing apparatus 1 and a display unit 7 for displaying the internal state of the information processing apparatus 1 are also provided on the upper surface of the information processing apparatus main body 2. The display unit 7 is configured using, for example, an LED (Light Emitting Diode).

  The size and shape of the information processing apparatus 1 according to the present invention are not limited to those shown in FIG. 1, and the arrangement, size, and shape of components such as the display 4 and the keyboard 5 shown in FIG. Is not limited to FIG.

  FIG. 2 is a diagram showing a functional configuration of an embodiment of the information processing apparatus 1 according to the present invention.

  The information processing apparatus 1 includes an OS (Operating System) 10 as basic software for managing the entire information processing apparatus 1.

  In addition, the information processing apparatus 1 includes a large number of application software 20 and a large number of data files 30 that operate under the management of 0S10. The application software 20 and the data file 30 are closely connected to each other for reading and writing data.

  The output of the application software 20 is connected to the display control means 40. The display control means 40 performs control for displaying various information on the display 4, and its output is connected to the display 4.

  In addition, the information processing apparatus 1 determines whether the display information includes confidential information based on the contents of the activated application software 20 and the data file 30, and determines whether the confidential information is included in the display information. A display time control unit 60 that controls the display time of display information according to the result, and a screen saver means 70 that shifts the screen on which the information is displayed to the screen saver screen are provided.

  In addition, the information processing apparatus 1 includes a display unit 7 for notifying the user of the information processing apparatus 1 when the confidential information determination unit 50 determines that the display information includes confidential information. ing.

  The display control operation of the information processing apparatus 1 configured as described above will be described.

  There are various methods for starting the information processing apparatus 1. For example, when the user depresses the power switch 6, 0S10 is first started. After the OS is started, appropriate application software 20 is started, for example, by a user operation.

  The application software 20 includes various application software such as document creation software, spreadsheet software, e-mail software, and Web browser. The number of the application software 20 to be activated is not limited to one, but may be a so-called multitask mode in which a plurality of application software 20 are activated and apparently operate simultaneously.

  When the application software 20 is activated, various information is exchanged with the corresponding data file 30 under the control of the CPU. The data file 30 is stored in a nonvolatile memory such as an HDD (Hard Disk Drive) (not shown) included in the information processing apparatus 1, and is appropriately used when data is read from or written to the application software 20. Data is transferred to and read from a memory (not shown).

  The data file 30 may be provided in an appropriate storage device such as an external server. In this case, data exchange between the application software 20 and the data file 30 is performed via a telecommunication line such as a LAN or the Internet.

  All or a part of the information of the data file 30 targeted by the application software 20 is edited and processed into an appropriate display signal by the display control means 40, and then output to the display 4 for use by the user.

  The display information displayed on the display device 4 is appropriately updated mainly by user operations. In addition, when the application software 20 is configured to exchange data via an electric communication line, the display information may be updated by data communication with the outside.

  At this time, when the user does not operate the information processing apparatus 1 for a predetermined time or when data communication with the outside is not performed for a predetermined time, screen saver software (hereinafter simply referred to as a screen saver) is used by the screen saver means 70. When executed, the screen shifts from the information display screen by the application software 20 to the screen saver screen.

  There are various types of screen saver screens, such as those that simply darken the screen and those that display an appropriate animation. Usually, the information processing apparatus 1 has a plurality of screen saver screens in advance, and the user Can be arbitrarily selected from these.

  When the user does not operate the information processing apparatus 1 for a predetermined time, the screen saver is executed to shift from the information display screen to the screen saver screen. This predetermined time may be referred to as a screen saver execution waiting time.

  The screen saver execution waiting time can be set in advance by the user (hereinafter, this time is referred to as a standard screen saver execution waiting time). In addition, it is possible to prohibit the execution of the screen saver.

  If the execution of the screen saver is prohibited, even if the user does not operate the time information processing apparatus 1 beyond the screen saver execution waiting time, the screen does not shift to the screen saver screen, and the information display screen by the application software 20 is maintained. It will be.

  By shifting to the screen saver screen, for example, a burn-in phenomenon of the CRT screen can be prevented. After shifting to the screen saver screen, the user cannot visually recognize the information display screen by the application software 20, but can immediately return to the original information display screen by an operation such as pressing any key of the keyboard 5. Is possible.

  Normally, the screen saver means 70 has an optional function of requesting authentication by a password when returning from the screen saver screen to the original information display screen.

  If the authentication by the password is successful, the screen saver screen can be restored to the original information display screen, but if the authentication by the password fails, the screen saver screen cannot be restored to the original information display screen.

  For this reason, once the screen saver screen is displayed, a third party who does not know the password cannot view the original information display screen, and for example, even when a legitimate user leaves the table, security for the display information is ensured. The

  However, many functions of the conventional screen saver means 70 are uniformly managed in 0S10, and the screen saver execution waiting time is set to a fixed time regardless of the contents of the data file 30 targeted by the application software 20. The For this reason, once the screen saver means 70 is made to function, even the data file 30 that does not contain confidential information is shifted to the screen saver screen after the screen saver execution waiting time, which is troublesome for the user. Become. In addition, when an authentication function using a password is set, a password release operation is added, which further increases complexity.

  In the information processing apparatus 1 according to the present invention, by adding the confidential information determination unit 50 and the display time control unit 60, it is automatically determined whether the content of the data file 30 targeted by the application software 20 includes confidential information. The screen saver execution waiting time is made shorter than the set standard screen saver execution waiting time only when confidential information is included.

  The confidential information determination unit 50 monitors the contents of the data file 30 targeted by the activated application software 20, and determines whether or not the display information that the application software 20 intends to display includes confidential information.

  The confidential information determination unit 50 may further divide the confidential level into three levels, for example, high, medium, and low, when confidential information is included.

  In the display time control unit 60, one screen saver execution waiting time corresponding to the classified security level is set from the plurality of screen saver execution waiting times previously held in the display time control unit 60. One screen saver execution waiting time is also set when the security level is not classified. At this time, the set screen saver execution waiting time is set to be shorter than the standard screen saver execution waiting time of the information processing apparatus 1.

  If confidential information is included, the confidential information determination unit 50 displays the confidential information on the display unit 7 in order to notify the user to that effect. By this display, the user can recognize that the screen saver execution waiting time is set shorter than the standard time. This display may be displayed on a part of the display screen of the display 4 by, for example, icon display.

  FIG. 3 shows a more detailed configuration of the display time control unit 60 and the screen saver means 70.

  The display time control unit 60 automatically sets a screen saver execution waiting time shorter than the standard screen saver execution waiting time based on the presence / absence of confidentiality determined by the confidential information determination unit 50 or information on the presence / absence of confidentiality and the confidentiality level. Set to and switch.

  The screen saver execution waiting time can be set by various methods. For example, the screen saver execution waiting time can be set by using a plurality of screen saver execution waiting time tables associated with the presence / absence of the secret and the secret level.

  On the other hand, a standard screen saver execution waiting time is input from the screen saver means 70 to the display time control unit 60. The screen saver execution waiting time set by the time control unit 60 is output to the screen saver means 70.

  The screen saver means 70 has a non-operation timer 72 and counts a time during which the user has not operated the information processing apparatus 1 (non-operation time). The comparison means 43 compares the non-operation time with the screen saver execution waiting time output from the display time control unit 60.

  When the non-operation time exceeds the screen saver execution waiting time output from the display time control unit 60, the display control means 40 is instructed to shift to the screen saver screen.

  FIG. 4 is a diagram showing a flow of processing according to an embodiment of the display control method of the information processing apparatus 1 according to the present invention.

  First, in step ST1, display information displayed on the display 4 is input from the application software 20 or the data file 30.

  Next, in step ST2, it is determined whether or not confidential information is included in the input display information.

  If confidential information is included (Yes in step ST2), the confidential level of the confidential information is further classified into, for example, high, medium, and low in step ST3.

  Furthermore, in step ST4, one screen saver execution waiting time corresponding to the classified security level is set from a plurality of screen saver execution waiting times set in advance. One screen saver execution waiting time is also set when the security level is not classified. At this time, the set screen saver execution waiting time is set to be shorter than the standard screen saver execution waiting time of the information processing apparatus 1.

  In step ST5, the display unit 7 is lit to notify the user that the screen saver execution waiting time has been set to be shorter than the standard screen saver execution waiting time.

  On the other hand, when the display information does not include confidential information (No in step ST2), a standard screen saver execution waiting time is set (step ST6). When the display unit 7 is lit, the display unit 7 is turned off.

  In step ST8, the screen saver is executed in accordance with the screen saver execution waiting time set in step ST4 or step ST6.

  According to the information processing apparatus 1 and the display control method thereof according to the present invention, it is determined whether or not confidential information is included in the content of display information of the data file 30 targeted by the application software 20, and the confidential information is included. In this case, since the screen saver execution waiting time can be set shorter than the standard screen saver execution waiting time, an opportunity for a third party to visually recognize the contents of the display information is reduced, and security for confidential information is improved.

  In particular, even when the user leaves the seat, since the screen saver screen is displayed in a short time, security for confidential information is ensured.

  On the other hand, when confidential information is not included in the contents of the display information, the standard screen saver execution waiting time is set. Therefore, if the standard screen saver execution waiting time is set in advance, the user can cancel the screen saver. You are freed from the complexity.

  As described above, according to the information processing apparatus 1 and the display control method thereof according to the present invention, the screen saver execution waiting time is controlled according to the work target (the contents of the data file 30) such as data and documents handled by the information processing apparatus 1. In addition, it is possible to ensure high confidentiality for work targets with high security while maintaining high operability for work objects with low security.

  By the way, various embodiments can be considered as means for automatically determining whether or not confidential information is included in the contents of the data file 30 targeted by the application software 20.

  FIG. 5 is a diagram illustrating a first embodiment of the confidential information determination unit 50.

  Usually, the data file 30 is composed of an attribute area 31 in which attributes (sometimes referred to as properties) of the data file are recorded, and an information area 32 in which information such as data and document contents is recorded. There are many cases.

  In the attribute area 31 of the data file 30, for example, the title of the data file 30, the name of the creator, the classification of the data file 30, the keywords related to the data file 30, or an appropriate comment can be recorded.

  The attribute information recorded in the attribute area 31 can be arbitrarily input by the user, for example, by opening the property window 21 of the application software 20 as shown in FIG.

  For example, when a user inputs an appropriate character string, for example, secret, confidential, copy prohibition, etc., in the “classification window” 212, “keyword window” 213, and “comment window” 215 of the property window 21, the information is used as attribute information. Recorded in the attribute area 31 of the data file 30.

  On the other hand, the confidential information determination unit 50 includes a keyword registration unit 51 that can register a predetermined keyword in advance, and a determination unit 52. In the keyword registration unit 51, for example, keywords suggesting confidentiality are registered, such as secret, confidential, confidential, and handling attention.

  The determination unit 52 of the confidential information determination unit 50 compares the attribute information recorded in the attribute region 31 of the data file 30 with the keyword registered in the keyword registration unit 51, and the attribute information recorded in the attribute region 31. If the keyword registered in the keyword registration unit 51 matches at least a part of the data file 30, it is determined that the confidential information is included in the data file 30.

  Further, by appropriately weighting the keywords registered in the keyword registration unit 51, it is possible to classify the confidential level of the confidential information.

  FIG. 6 is a diagram illustrating a second embodiment of the confidential information determination unit 50.

  The determination unit 52 a of the confidential information determination unit 50 according to the second embodiment inputs information recorded in the information area 32 in the data file 30. The keyword registration unit 51 of the confidential information discriminating unit 50 is the same as that of the first embodiment. For example, keywords that indicate confidentiality such as secret, confidential, and confidential are registered.

  Various information is written into the information area 32 of the data file 30 by the application software 20. This information includes at least a part of the information recorded in the information area 32 and the keyword registration unit 51, for example, when information (character string) such as “Needs confidentiality is required” is included in this information. If the keyword registered in the URL matches, the confidential information determination unit 50 determines that the confidential information is included in the data file 30.

  As in the first embodiment, it is possible to classify the confidential level of confidential information by appropriately weighting the keywords registered in the keyword registration unit 51.

  FIG. 7 is a diagram illustrating a third embodiment of the confidential information determination unit 50.

  The confidential information determination unit 50 according to the third embodiment includes a determination unit 52 b and a personal information database 53.

  Personal information 32 a may be written in the information area 32 of the data file 30 targeted by the application software 20. The personal information 32a includes, for example, an individual's name, address, telephone number, and e-mail address. The data file 30 including the personal information 32a can generally be considered as highly confidential information.

  When the information area 32 of the data file 30 includes personal information 32a, the confidential information determination unit 50 according to the third embodiment determines that the data file 30 includes confidential information.

  The personal information database 53 provided in the confidential information discriminating unit 50 includes, for example, a Japanese main surname, a Japanese municipality name, a Japanese telephone area code, a specific symbol string indicating an e-mail address, and the like. The personal information database 53 may be further expanded to include foreign personal information.

  The determination unit 52b included in the confidential information determination unit 50 determines whether or not the information included in the personal information database 53 exists in at least a part of the information included in the information area 32 of the data file 30. The data file 30 is determined to contain confidential information.

  FIG. 8 is a diagram illustrating a fourth embodiment of the confidential information determination unit 50.

  The confidential information determination unit 50 according to the fourth embodiment includes a password setting determination unit 54.

  Depending on the type of application software 20, a read password or a write password can be set when the target data file 30 is saved. If a read password or a write password is set and saved, the next time the data file 30 is opened, the data file 30 cannot be opened unless the set password is input.

  The data file 30 in which the read password or the write password is set and stored can be generally considered as a highly confidential data file 30.

  The confidential information determination unit 50 according to the fourth embodiment determines whether or not a read password or a write password is set by the password setting determination unit 54. If the read password or the write password is set, the data file 30 is It is determined that there is confidentiality.

  FIG. 9 is a diagram illustrating a fifth embodiment of the confidential information determination unit 50.

  The confidential information determination unit 50 according to the fifth embodiment includes a confidential term database 55 and a determination unit 52c.

  Information on all areas of the data file 30 is input to the determination unit 52c according to the fifth embodiment. On the other hand, the confidential term database 55 is configured to include terms corresponding to concepts that can be regarded as substantially the same in addition to the terms “secret”, “copying prohibition”, and “takeout prohibition”. For example, terms corresponding to a concept that can be regarded as substantially the same as “secret” include terms such as confidential, confidential, confidential, confidential, confidential, secret, privacy, confidence, confidential, and the like. In addition, terms corresponding to the concept that can be regarded as substantially the same as “copy prohibited” include terms such as copy strict prohibition, copy prohibition, and copy strict prohibition, or foreign languages corresponding thereto. In addition, terms corresponding to the concept that can be regarded as substantially the same as “prohibited to carry out” include terms such as strict prohibition of taking out and prohibition, or foreign languages corresponding thereto.

  In addition, since the determination unit 52c according to the fifth embodiment uses information on all areas of the data file 30 as a determination target, for example, “confidential” set as a watermark character of a document is also a determination target.

  When the confidential information determination unit 50 according to the fifth embodiment includes at least part of the information included in the entire area of the data file 30 in the confidential term database 54, the confidential information determination unit 50 includes the confidential information in the data file 30. Determine.

  FIG. 10 is a diagram illustrating a sixth embodiment of the confidential information determination unit 50.

  The confidential information determination unit 50 according to the sixth embodiment includes an encrypted data detection / encrypted software activation detection determination unit 56.

  All or part of the data file 30 targeted by the application software 20 may be encrypted using specific encryption software 80.

  It can be determined that the encrypted data file 30 is highly confidential. In addition, in order to encrypt the data file 30, it is necessary to activate a specific encryption software 80. When the encryption software 80 is activated, the data file 30 to be encrypted is confidential. It may be determined that there is.

  The encrypted data detection / encrypted software activation detection determination unit 56 according to the sixth embodiment detects whether or not the encrypted area 32b exists in the information area 32 of the data file 30, and also includes the encrypted software. If the encrypted area 32a exists in at least a part of the information area 32, or if the encryption software 80 is activated, the confidential information is stored in the data file 30. Is included.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be appropriately combined.

The perspective view which shows the example of an external appearance of one Embodiment of the information processing apparatus which concerns on this invention. The figure which shows the functional system of one Embodiment of the information processing apparatus which concerns on this invention. The figure which shows the detailed functional system of one Embodiment of the information processing apparatus which concerns on this invention. The figure which shows the flow of the process which concerns on one Embodiment of the display control method of the information processing apparatus which concerns on this invention. The figure which shows 1st Embodiment of the confidential information discrimination | determination part in the information processing apparatus which concerns on this invention. The figure which shows 2nd Embodiment of the confidential information discrimination | determination part in the information processing apparatus which concerns on this invention. The figure which shows 3rd Embodiment of the confidential information discrimination | determination part in the information processing apparatus which concerns on this invention. The figure which shows 4th Embodiment of the confidential information discrimination | determination part in the information processing apparatus which concerns on this invention. The figure which shows 5th Embodiment of the confidential information discrimination | determination part in the information processing apparatus which concerns on this invention. The figure which shows 6th Embodiment of the confidential information discrimination | determination part in the information processing apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information processing apparatus 4 Display 7 Display part 10 OS
20 Application software 30 Data file 31 Attribute area 32 Information area 40 Display control means 50 Confidential information discrimination section 60 Display time control section 70 Screen saver means 80 Encryption software

Claims (3)

An information processing apparatus having a display for displaying various types of information, wherein the information display screen displayed on the display is automatically switched to a screen saver screen when the information processing apparatus is not operated for a predetermined time. In an information processing apparatus having means,
A confidential information discriminating unit for discriminating whether or not the confidential information is included in the display information displayed on the display;
A display time control unit for shortening the predetermined time when confidential information is included in the display information ;
A display unit provided separately from the display;
With
When the predetermined time is shortened, the confidential information determination unit displays a display to that effect on at least one of the display unit and the display unit.
An information processing apparatus characterized by that . Further comprising a data file that contains the display information, the data file is configured to include an attribute area showing an attribute of the information area and the data file that contains the display information,
The information processing apparatus according to claim 1, wherein the confidential information determination unit determines that the display information includes confidential information when personal information including a personal name is included in the information area. . An information processing apparatus having a display for displaying various information and a display unit provided separately from the display, and displayed on the display when the information processing apparatus is not operated for a predetermined time. In a display control method for an information processing apparatus having screen saver means for automatically switching an information display screen to a screen saver screen,
Determining whether or not confidential information is included in the display information displayed on the display,
When confidential information is included in the display information, the predetermined time is shortened ,
When shortening the predetermined time, a display indicating that is displayed on at least one of the display and the display unit.
A display control method characterized by the above.

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