KR101537272B1 - System and method of controlling user device for managing information security - Google Patents

Abstract

The present invention relates to a user terminal control system and method for information security management, and more particularly, to a management server including an image code management unit for transmitting a function control image code to a user terminal when receiving a control request signal from the user terminal. A reader for scanning a function control image code displayed on a display unit of the user terminal; And an administrator terminal for transmitting a result of the scan from the reader to the management server. When the scan result of the image code received from the administrator terminal matches the image code transmitted to the user terminal, And the user terminal controls at least one function of the user terminal based on the control approval signal received from the management server, and a method using the same.

Description

[0001] SYSTEM AND METHOD FOR CONTROLLING USER DEVICE FOR MANAGING INFORMATION SECURITY [0002]

The present invention relates to a user terminal control system and method for information security management. More particularly, the present invention relates to a system and method for controlling a user terminal such as a smart phone, System and method.

Recently, widely used mobile communication terminals such as smart phones and tablet PCs have various functions. In addition to basic communication functions, it provides various functions such as camera function, Bluetooth function, wireless LAN function, tethering function, USB function, audio / video recording or recording function, Also, miniaturization and advancement are being made. In addition to smartphones, the trend is the same for various mobile devices such as digital cameras, small camcorders, tablet computers, and the like.

On the other hand, information leakage cases using mobile devices are increasing in accordance with this trend. In a research institute that requires confidentiality, it is a typical case that a design drawing is taken using a mobile device such as a smart phone or a tablet PC to leak out information or to leak a technical content using a voice / video recording function .

Therefore, in a company that needs security, a method for preventing such information leakage is to leave the terminal when entering the security area or attaching a seal to the camera of the terminal.

In addition, a method of remotely managing a mobile device by a MDM (Mobile Device Management) concept has been proposed, but the related infrastructure is not supported, or the method is complicated and cumbersome to use.

Korean Patent Laid-Open Publication No. 10-2013-0050865 (published on May 17, 2013) discloses a system and method for preventing leakage of internal confidential data through a smart device, A method for enabling a smart device to use a high function only in a configured wireless Internet area (WiFi) is disclosed.

However, this method has a limit in that it is required to access only the authorized access point, and the smart device function can be used within the authorized access point, so that there is still a limit in that the possibility of information leakage using the smart device can not be excluded.

Korean Patent Publication No. 10-2013-0050865 (published on May 16, 2013)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to reduce the administrative burden of the user regarding the rejection and security of a user by installing a program by himself / herself and requesting access, And to provide a system and method for preventing information leakage using a user terminal and performing log management of a user terminal by simple and efficient control.

According to an aspect of the present invention, there is provided a user terminal control system for information security management comprising an image code management unit for transmitting a function control image code to a user terminal when receiving a control request signal from the user terminal A management server; A reader for scanning a function control image code displayed on a display unit of the user terminal; And an administrator terminal for transmitting a result of the scan from the reader to the management server. When the scan result of the image code received from the administrator terminal matches the image code transmitted to the user terminal, And the user terminal controls at least one function of the user terminal based on the control approval signal received from the management server.

The mobile communication terminal may further include an AP for coupling the user terminal and the management server through a network and transmitting data between the user terminal and the management server through a wireless LAN with the user terminal.

Also, the management server includes a configuration information management unit for storing application program configuration information and terminal control policy information, and the user terminal includes an application program for controlling a user terminal, and when the application program for controlling a user terminal is executed, And the management server may transmit the application program configuration information and the terminal control policy information stored in the configuration information management unit to the user terminal through the AP.

Also, the user terminal may set an application program based on the application program setting information, display a user interface on the display unit, and display the terminal control policy information through the user interface.

Also, the user terminal may generate a control request signal according to a user selection input signal based on terminal control policy information displayed through the user interface, and transmit the control request signal to the management server through the AP.

Also, the control request signal may include user terminal related information and application program related information for controlling the user terminal, and the management server may store the user terminal related information and the application program related information included in the control request signal, And a user terminal information management unit for managing the user terminal information.

In addition, the image code management unit of the management server determines whether the scan result of the image code received from the administrator terminal matches the image code transmitted to the user terminal. If the scan code matches the image code, the management server transmits a control approval signal to the user terminal , The user terminal may control at least one function of the user terminal based on the terminal control policy information when receiving the control approval signal from the management server.

Also, the user terminal may be configured to store the function log information related to the controlled functions and the program log information about the access record for the application program for controlling the user terminal when at least one function of the user terminal is controlled.

Further, the management server may further include an integrity checking unit for checking the function log information and the program log information, and the user terminal transmits a control release request signal including the function log information and the program log information to the management server , The integrity checking unit of the management server checks the function log information and the program log information, and if there is no abnormality, the management server may transmit the function control release image code to the user terminal.

Also,

The reader scans image codes for function control release displayed on the display unit of the user terminal, the administrator terminal transmits the results of the scan from the reader to the management server, and the management server transmits image codes The control terminal sends a control release acknowledgment signal to the user terminal when the scan result of the user is identical with the image control code for the function control release transmitted to the user terminal, The function of the terminal may be restored.

According to another aspect of the present invention, there is provided a method for controlling a user terminal in a user terminal control system for information security management, the method comprising: a first step of a control server receiving a control request signal from a user terminal; A second step of the management server transmitting the function control image code to the user terminal; A third step in which the reader scans the image code for function control displayed on the display unit of the user terminal and transmits the scanned result to the administrator terminal; A fourth step of the manager terminal transmitting the scanned result to the management server; And a fifth step of transmitting a control permission signal to the user terminal when the scan result of the image code received from the management terminal by the management server matches the image code transmitted to the user terminal, And at least one function of the user terminal is controlled based on a control approval signal.

A seventh step of transmitting a control release request signal including function log information and program log information to a management server; The management server examines the function log information and the program log information, and if there is no abnormality, the management server transmits an image code for releasing the function control to the user terminal; A ninth step in which the reader scans the function control release image code displayed on the display unit of the user terminal and transmits the scanned image code to the administrator terminal; (B) transmitting the result of the scan from the reader to the management server; And a control step of transmitting a control release acknowledgment signal to the user terminal when the scan result of the image code received from the management terminal matches the image code for the function control release transmitted to the user terminal, May be configured to restore the function of the user terminal that was controlled based on the control release acknowledgment signal received from the management server.

According to the present invention, it is possible to provide a system and method for preventing information leakage using a user terminal and performing log management of a user terminal by simply and efficiently controlling functions of the user terminal in a security domain requiring information security management have.

FIG. 1 is a diagram illustrating the overall configuration and connection relationship of a user terminal control system 100 for information security management according to an embodiment of the present invention.
2 is a diagram showing an internal configuration of the management server 10. As shown in FIG.
FIG. 3 is a diagram illustrating an embodiment of a user terminal control method for information security management by the system 100 illustrated in FIG. 1 and FIG.
FIG. 4 illustrates a process of restoring the function of the user terminal 50 when the user desires to leave the security area when the function of the user terminal 50 is controlled (deactivated) according to the method described with reference to FIG. 1 to FIG. Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating the overall configuration and connection relationship of a user terminal control system 100 for information security management according to an embodiment of the present invention.

Referring to FIG. 1, a user terminal control system 100 (hereinafter, referred to as a 'system 100') for information security management of the present embodiment includes a management server 10, a reader 20, an administrator terminal 30, And AP (40).

The system 100 is installed in a security area requiring information security management, such as a research institute of a company, and controls functions such as inactivating and activating various functions of the user terminal 50 entering and exiting the security area Main features. To this end, the system 100 is characterized in that it operates as follows.

That is, the management server 10 receives the control request signal for controlling the function of the user terminal 50 from the user terminal 50 and transmits the function control image code to the user terminal 50, and the user terminal 50 The reader 20 displays the received image code on the display unit and scans the function control image code displayed on the display unit of the user terminal 50 and transmits the scanned image code to the management server 10 through the administrator terminal 30. [

Thereafter, when the scan result of the image code received from the manager terminal 30 matches the image code transmitted to the user terminal 50, the management server 10 transmits a control approval signal to the user terminal 50, The user terminal 50 is characterized in that at least one function of the user terminal 50 is controlled based on the control approval signal received from the management server 50. [

Hereinafter, each component and operation of the present system 100 will be described in detail.

First, an access point (AP) 40 is a known access point for providing a wireless LAN service, and is connected to the user terminal 50 through a wireless LAN (WiFi). The AP 40 in the present invention is a dedicated AP for performing the present invention and is connected only to the management server 10 to perform a function of transmitting data between the management server 10 and the user terminal 50 . That is, the AP 40 transmits / receives data between the user terminal 50 and the management server 10, and transmits / receives data to / from the user terminal 50 via the wireless LAN.

The user terminal 50 is, for example, a mobile communication terminal. In particular, the user terminal 50 is preferably a smart phone or a tablet PC capable of installing and executing an application program. The user terminal 50 is provided with an application program for controlling the user terminal to perform the present invention. Here, the application program may be installed through a known app store or market, and the user terminal 50 may access the AP 40 and install the application program through the management server 10. Since the present invention is applied to the security area as described above, the administrator can induce the installation at a gateway of the security area by notifying the user that installation of the application program is required to access the user.

When the application program is installed and executed in the user terminal 50, the user terminal 50 automatically accesses the management server 10 through the AP 40, And receives the control policy information through the AP 40. [

Here, the application program setting information means information such as interface information (e.g., a company name, a company logo, and other specific registration phrases) related to a security area displayed on the display unit at the time of execution of an application program.

The user terminal 50 sets an application program based on the application program setting information and displays the user interface on the display unit based on the setting.

On the other hand, the terminal control policy information refers to the function control policy information of the terminal set to be applied to the security area. This control policy information sets which function of the terminal 50 is to be controlled, and can be set differently according to the security area.

The control policy information applicable to the present invention may be as follows.

1) 3G / 4G connection limitation

2) Restrictions on unauthorized WLAN access

3) Whether wireless communication functions such as WiBro, tethering, and Bluetooth are restricted

4) USB connection limitation

5) Whether the camera function is limited

6) Whether the screen capture function is limited

7) Whether voice recording or video recording function is restricted

The control policy information may be provided through the user interface of the user terminal 50 to allow the user to recognize the control policy information.

When the control policy information is provided through the interface of the user terminal 50 and the user who recognizes the control policy information wants to accept the control policy information, A control request signal is generated at the user terminal 50 and transmitted to the management server 10 through the AP 40. [

At this time, the control request signal may include user terminal related information and application program related information for controlling the user terminal.

The user terminal related information may be user related information such as a user name, a telephone number, an e-mail address, and the like of the user terminal 50, for example.

The application-related information means information related to an application program, such as an application program start time, application program-related license information applied to a security area (for example, a specific company), and the like.

When the control server 10 receives the control request signal from the user terminal 50 via the AP 40, the management server 10 generates an image code for function control and sends the generated image for function control to the user terminal 50 via the AP 40. [ Lt; / RTI >

The function control image code generation can be performed by only the signal or basic information received by the "access request" selected by the user terminal 50. If necessary, a separate access application procedure is performed to pre- 10 or by registering the user information directly in the management server 10 at the entry and exit sites and by comparing the signals with the basic information received from the user terminal 50. [ On the other hand, if there is an access control system already, the access application procedure can be replaced with fetching user information through interworking between servers.

Here, the image code is preferably a QR code, for example. Since the function control image code is for authentication, appropriate data for this purpose is encoded and generated as an image type code such as a QR code.

The created image for function control is transmitted to the user terminal 50 and displayed on the display unit of the user terminal 50 and scanned through the reader 20 and the scan result is transmitted to the management server 10 through the administrator terminal 30 . The management server 10 transmits a control approval signal to the user terminal 50 through the AP 40 when the received scan result matches the image code transmitted to the user terminal 50. [

The user terminal 50 controls at least one function of the user terminal 50 in accordance with the terminal control policy information received previously when the control approval signal is received from the management server 10. As described above, the control policy information sets whether or not to control various functions provided by the terminal 50 according to the security domain, and controls the corresponding function of the terminal 50 according to the corresponding control policy information. As described above, the security area can be controlled to disable the function of the terminal 50 such as a camera function, a communication function, and the like that can prevent information leakage because it is an area where information security management is required, . As will be described later, when the user wishes to leave the security area, the disabled function may be controlled to be activated again.

The control method of deactivating / activating the function of the terminal 50 according to the control policy information is well known in the prior art, and is not a direct object of the present invention, so a detailed description thereof will be omitted. That is, the control of the function of the terminal 50 can use the technology known in the prior art as it is.

Meanwhile, when at least one function of the terminal is controlled, the user terminal 50 stores the function log information related to the controlled functions and the program log information about the access record for the application program for controlling the user terminal.

The function log information refers to log information related to the function, such as whether or not there is an operation attempt for each function for each controlled function.

The program log information refers to log information such as whether there is an attack attempt (inactivation, termination attempt, etc.) for the control application program itself of the user terminal 50 or an access attempt by an administrator.

The function log information and the program log information are used for confirming whether there is a problem by checking the corresponding information when restoring the disabled function when the user leaves the security area as described later.

1, the reader 20 is connected to the administrator terminal 30 and performs a function of scanning the image code displayed on the display unit of the user terminal 50 and transmitting the scanned image code to the administrator terminal 30 do.

The administrator terminal 30 transmits the scan result from the reader 20 to the management server 30. Also, the manager terminal 30 is connected to the management server 30 and transmits / receives information related to the user terminal 50, and displays the information through the display unit so that the administrator can recognize the information.

As described above, since the system 100 of the present invention is suitable for the security area, it is preferable that the reader 20 and the administrator terminal 30 are installed at the entrance of the security area. Also, the AP 40 is preferably installed at the entrance of the security area as well.

Meanwhile, the management server 10 may combine with the access management system (not shown) to store all the information related to the user terminal 50 to generate the access management record database.

In this way, the function of the user terminal 50 is controlled to be inactivated according to the control policy information, and the log related to the use of the user terminal 50 is stored by the application program. A visit to the security area is permitted and the user will carry the task in the security area with the user terminal 50 having a limited function.

2 is a diagram showing an internal configuration of the management server 10. As shown in FIG.

2, the management server 10 includes an image code managing unit 11, a setting information managing unit 12, a user terminal information managing unit 13, and an integrity checking unit 14.

The image code managing unit 11 transmits a function control image code to the user terminal 50 when receiving the control request signal from the user terminal 50 as described above. The image code management unit 11 determines whether the scan result of the image code received from the administrator terminal 30 matches the image code transmitted to the user terminal 50. [ The management server 10 transmits a control approval signal to the user terminal 50 when the image code management unit 11 matches the determination result.

The setting information management unit 12 stores application program setting information and terminal control policy information as described above. The management server 10 allows the user terminal 50 to access the management server 10 The AP 40 transmits the application program setting information and the terminal control policy information stored in the setting information management unit 12 to the user terminal 50.

The user terminal information management unit 13 stores and manages user terminal related information included in a control request signal transmitted from the user terminal 50 and application program related information for controlling the user terminal as described above.

The integrity checking unit 14 receives the function log information and the program log information stored in the user terminal 50 as described above, and checks the function log information and the program log information to determine whether there is any abnormality. If there is no abnormality, the management server 10 transmits the function control release image code to the user terminal 50. The integrity checking unit 14 is used for restoring a controlled function, and a detailed description thereof will be given later.

On the other hand, although not explicitly shown in FIG. 2, the management server 10 may further include means for storing a license policy of an application program and means for storing an application program. As described above, the application program of the present invention can provide different setting information according to the security area according to the information stored in the setting information management part 12, so that it can be used in a plurality of security areas by using one application program. For example, if an application program according to the present invention is used in a plurality of different companies but different setting information is used, the system and method according to the present invention can be operated according to the environment suitable for each company. Therefore, in the present invention, it is preferable to separately store and manage the license policies set for each company.

FIG. 3 is a diagram illustrating an embodiment of a user terminal control method for information security management by the system 100 illustrated in FIG. 1 and FIG.

Referring to FIG. 3, an application program for controlling a user terminal is installed and executed in the user terminal 50 (S100). As described above, since the present invention is applied to the security area, when the user who has the user terminal 50 approaches the entrance of the security area, the administrator of the security area installs the corresponding application program. Or download the application from the App Store. Of course, the AP 40 may be connected to download the application program from the management server 10, and install the application program.

When the application program is installed and executed, the user terminal 50 accesses the management server 10 through the AP 40 (S110, S120). As described above, the AP 40 is a dedicated AP connected to the management server 10 to provide the wireless LAN service to the user terminal 50 by transmitting / receiving data to / from the user terminal 50 via the wireless LAN. When accessing the AP 40, the management server 10 is automatically connected. It is preferable that the connection to the AP 40 is guided by the administrator of the entrance of the security area by informing the SSID of the AP 40 that the user of the user terminal 50 can select and access the AP 40 .

The management server 10 transmits the application program setting information and the terminal control policy information stored in the setting information management unit 12 to the connected user terminal 50 to the user terminal 50 via the AP 40 ).

The user terminal 50 sets an application program based on the application program setting information received from the management server 10 and displays the user interface on the display unit. In addition, the terminal control policy information received from the management server 10 through the user interface is displayed (S150).

If the control policy information is provided through the interface of the user terminal 50 and the user who recognizes the control policy information wants to accept the control policy information, for example, when the "access request" button provided in the interface is selected, A control request signal is generated in the user terminal 50 in step S160 and transmitted to the management server 10 through the AP 40 in steps S170 and S180. At this time, the control request signal may include user terminal related information and application program related information for controlling the user terminal.

The management server 10 generates an image code for function control (S190) and transmits the generated image code for function control to the user terminal 50 via the AP (40) 40) (S200, S210). Here, as described above, the image code is preferably a QR code.

The image code transmitted to the user terminal 50 is displayed on the display unit of the user terminal 50 (S220), and the reader 20 scans the displayed image code (S230). The scanned result is transmitted to the management server 10 through the administrator terminal 30 (S240, S250).

The management server 10 confirms whether the received scan result matches the image code transmitted to the user terminal 50 in step S260 and sends a control approval signal to the user terminal 50 through the AP 40 (S270, S280).

The user terminal 50 receives the control approval signal from the management server 10 and controls at least one function of the user terminal 50 according to the terminal control policy information that has been received at step S290.

If at least one function of the terminal is controlled, the user terminal 50 stores the function log information related to the controlled functions and the program log information about the access record for the application program for controlling the user terminal (S300).

Next, a method for restoring the controlled function of the user terminal 50 will be described with reference to FIG. 4 and the following.

FIG. 4 illustrates a process of restoring the function of the user terminal 50 when the user desires to leave the security area when the function of the user terminal 50 is controlled (deactivated) according to the method described with reference to FIG. 1 to FIG. Fig.

Referring to FIG. 4, when the user terminal 50 is controlled (deactivated) as described with reference to FIGS. 1 to 3 and the user desires to leave the security area after finishing work in the security area, For example, a "leave request" Thereby, a control release request signal is generated in the user terminal 50 (S300) and transmitted to the management server 10 through the AP 40 (S310, S320). At this time, the control release request signal includes the above-described function log information and program log information.

The integrity checking unit 14 of the management server 10 checks the function log information and the program log information received from the user terminal 50 (S330). As described above, the function log information means log information related to the function, for example, whether or not there is an operation attempt for each function for each controlled function, and the program log information is used for controlling application Log information such as whether there was an attack attempt (deactivation, termination attempt, etc.) on the program itself, or whether there was an access attempt by an administrator. Upon checking the function log information and the program log information, the user terminal 50 can determine whether the controlled functions are well maintained in the secure area and whether there is an attempt to cause a security problem using the user terminal 50 have.

If there is no abnormality, the management server 10 transmits the function control release image code to the user terminal (S340, S350).

The user terminal 50 displays the received image code for releasing the function control on the display unit (S360), and the reader 20 scans the displayed image code (S370). The scanned result is transmitted to the management server 10 through the administrator terminal 30 (S3800, S390).

The management server 10 confirms whether the received scan result matches the function control release image code transmitted to the user terminal 50 in step S400 and if the scan result is matched to the user terminal 50 via the AP 40 And transmits a control release acceptance signal (S410, S420).

Upon receipt of the control release acknowledgment signal, the user terminal 50 refers to the terminal control policy information and restores the functions of the previously controlled terminal (S430).

Through this process, the controlled functions of the user terminal 50 are recovered again and all the functions can be normally operated.

4, when the management server 10 receives the scan result, if the received scan result is matched with the scan result, the function log information and the program log information that were received in the previous step, Related information and application program related information for controlling the user terminal may be integrally stored and stored in an access management system (not shown).

If necessary, after step S430, the user may be allowed to select whether to delete the application program through the interface of the application program.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

For example, in the above-described embodiment, the dedicated AP 40 for performing the present invention is used, but an AP having a specific SSID may be used.

100 ... User terminal control system
10 ... management server
20 ... readers
30 ... administrator terminal
40 ... AP
50 ... user terminal

Claims (12)

A user terminal control system for information security management,
A management server including an image code management unit for transmitting a function control image code to a user terminal when receiving a control request signal from the user terminal;
A reader for scanning a function control image code displayed on a display unit of the user terminal;
An administrator terminal for transmitting a result of the scan from the reader to a management server; And
An AP for transmitting data between a user terminal and a management server via a network by combining the user terminal with a management server through a network,
Lt; / RTI >
Wherein the management server includes a setting information management unit for storing application program setting information and terminal control policy information,
Wherein the user terminal comprises an application program for controlling the user terminal and accesses the management server through the AP when the application program for controlling the user terminal is executed, and the management server comprises application program setting information and terminal control policy information To the user terminal through the AP,
Wherein the management server transmits a control approval signal to the user terminal when the scan result of the image code received from the administrator terminal matches the image code transmitted to the user terminal,
Wherein the at least one function of the user terminal is controlled based on the control approval signal received from the management server.
delete delete The method according to claim 1,
Wherein the user terminal sets an application program based on the application program setting information, displays a user interface on the display unit, and displays the terminal control policy information through the user interface.
5. The method of claim 4,
Wherein the user terminal generates a control request signal according to a user selection input signal based on terminal control policy information displayed through the user interface and transmits the control request signal to the management server through the AP.
6. The method of claim 5,
Wherein the control request signal includes user terminal related information and application program related information for controlling the user terminal,
Wherein the management server comprises a user terminal information manager for storing and managing user terminal related information and application program related information included in the control request signal.
6. The method of claim 5,
Wherein the image code management unit of the management server determines whether the scan result of the image code received from the administrator terminal matches the image code transmitted to the user terminal, and when the match is successful, the management server transmits a control approval signal to the user terminal,
Wherein the at least one function of the user terminal is controlled based on the terminal control policy information when the user terminal receives the control approval signal from the management server.
8. The method of claim 7,
Wherein when the at least one function of the user terminal is controlled, the user terminal stores the function log information related to the controlled functions and the program log information for the access record for the application program for controlling the user terminal. system.
9. The method of claim 8,
Wherein the management server further comprises an integrity checking unit for checking the function log information and the program log information,
The user terminal transmits a control release request signal including the function log information and the program log information to the management server,
Wherein the integrity checking unit of the management server checks the function log information and the program log information, and when there is no abnormality, the management server transmits the function control release image code to the user terminal.
10. The method of claim 9,
The reader scans an image code for releasing the function control displayed on the display unit of the user terminal,
The manager terminal transmits the scan result from the reader to the management server,
Wherein the management server transmits a control release acknowledgment signal to the user terminal when the scan result of the image code received from the administrator terminal matches with the image control code for the function control release transmitted to the user terminal,
Wherein the user terminal restores the function of the user terminal that was controlled based on the control release acknowledgment signal received from the management server.
10. A method for controlling a user terminal in a user terminal control system for information security management according to any one of claims 1 to 10,
And a setting information management unit for storing application program setting information and terminal control policy information when the user terminal accesses the management server when the application program for controlling the user terminal is executed in the user terminal having the application program for controlling the user terminal A server for transmitting application program setting information and terminal control policy information stored in the setting information management unit to a user terminal through an AP;
A second step of the management server receiving a control request signal from the user terminal;
A third step of the management server transmitting the function control image code to the user terminal;
A fourth step in which the reader scans the image code for function control displayed on the display unit of the user terminal and transmits the scanned result to the administrator terminal;
A fifth step of transmitting the scan result of the manager terminal to the management server; And
A sixth step of transmitting a control approval signal to the user terminal when the management server matches the image code transmitted from the administrator terminal to the image code transmitted to the user terminal
Lt; / RTI >
Wherein at least one function of the user terminal is controlled based on a control approval signal received from the management server by the user terminal.
12. The method of claim 11,
A seventh step of the user terminal transmitting a control release request signal including the function log information and the program log information to the management server;
The management server examines the function log information and the program log information, and if there is no abnormality, the management server transmits an image code for releasing the function control to the user terminal;
A ninth step in which the reader scans the function control release image code displayed on the display unit of the user terminal and transmits the scanned image code to the administrator terminal;
(B) transmitting the result of the scan from the reader to the management server; And
And a control step of transmitting a control release acknowledgment signal to the user terminal when the scan result of the image code received from the management terminal matches the image code for the function control release transmitted to the user terminal
Lt; / RTI >
Wherein the user terminal restores the function of the user terminal that was controlled based on the control release acknowledgment signal received from the management server.

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