JP6223878B2 - Communication system, communication terminal, and terminal control method - Google Patents

Description

  The present invention relates to a communication system, a communication terminal included in the communication system, and a terminal control method.

  Conventionally, there has been known a method of remotely controlling a communication terminal in consideration of a case where a communication terminal such as a mobile phone is lost (for example, see Patent Document 1). In recent years, various services related to remote control of highly functional communication terminals such as smartphones or tablet terminals have been provided. In such a service, when an SMS (Short Message Service) transmitted from the server on the service provider side is received on the communication terminal side, an application related to remote operation is started and processing instructed by the SMS is performed. The method of doing is generally used. This remote operation processing method is standardized by OMA (Open Mobile Alliance) and the like. The above method is preferably used when the communication terminal is locked and the usable functions are restricted particularly when the communication terminal is lost.

JP 2010-258504 A

  When terminal lock is performed at the communication terminal, a release code set by the user or a temporary release code automatically generated by the communication terminal is used. When the user sets the release code, the user knows the release code, so if the communication terminal cannot receive the SMS related to the remote operation, the user inputs the release code directly to the communication terminal. The terminal lock can be released with. However, since the temporary release code generated in the communication terminal is not notified to the network side, the user cannot know the temporary release code, and the terminal lock cannot be released by entering the temporary release code. There was a problem that the terminal lock could not be released.

  The present invention has been made in view of the above, and an object of the present invention is to provide a communication terminal, a communication system, and a terminal control method capable of reliably locking and releasing a communication terminal.

  To achieve the above object, a communication system according to the present invention includes a server device and a communication terminal, and is a communication system that locks the terminal of the communication terminal by remote operation by the server device, the server An apparatus includes: a terminal lock instruction means for transmitting a terminal lock instruction signal for instructing the terminal lock to the communication terminal; and for releasing the terminal lock transmitted from the communication terminal that has transmitted the terminal lock instruction signal. A release code storage means for associating the release code used for the communication terminal with information for specifying the communication terminal, wherein the communication terminal receives the terminal lock instruction signal transmitted from the server device. Receiving means, release code generating means for generating a release code based on the terminal lock instruction signal, and using the release code And terminal lock means for locking the own apparatus Te, characterized in that it comprises a release code transmitting means for transmitting the release code to the server apparatus.

  Further, a communication terminal according to the present invention is a communication terminal that locks its own terminal by a remote operation by a server device, an instruction signal receiving means for receiving a terminal lock instruction signal transmitted from the server device, Based on a terminal lock instruction signal, a release code generating means for generating a release code used for releasing the terminal lock, a terminal lock means for locking the own device using the release code, and the release code Release code transmitting means for transmitting to the server device.

  According to the communication system and the communication terminal described above, the release code used to release the terminal lock is generated by the release code generation means of the communication terminal, and the release code is transmitted to the server device. As a result, the server device can hold the release code used to release the terminal lock in the communication terminal. For example, if the terminal lock of the communication terminal cannot be released by remote operation, the server device holds the release code. The terminal lock can be released using the released release code. Therefore, the terminal lock and release of the communication terminal can be reliably performed as compared with the conventional configuration.

  Here, the release code generation means determines whether the release code is set in advance by a user, and generates a temporary release code if the release code is not set in advance, and the terminal lock means Locks itself using the release code or the temporary release code, and the release code transmitting means uses the temporary release code as the release code when the temporary release code is generated. It can be set as the aspect which transmits with respect to.

  As described above, when the release code is set in advance by the user, the release code is used. When the release code is not set, a temporary release code is generated and the release code set by the user is set. Alternatively, the terminal can be locked using the temporary release code generated by the release code generation means and transmitted to the server device, so that the release code is generated when the release code is set by the user. It is not performed, and the processing amount in the communication terminal can be reduced.

  Furthermore, when the release code is set in advance by the user, the release code transmitting means does not transmit the release code to the server device, and when the temporary release code is generated, The temporary release code can be transmitted to the server device as a release code.

  When the user has set a release code in advance, it is considered that the release code is grasped by the user. Therefore, by adopting the above configuration, the configuration is such that the release code set by the user is not transmitted to the server device, so that the release code set by the user is not transmitted from the communication terminal to the outside, and security is improved. In addition, the amount of communication between the communication terminal and the server device can be reduced.

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

  That is, a terminal control method according to the present invention includes a server device and a communication terminal, and is a terminal control method by a communication system that performs terminal lock of the communication terminal by remote operation by the server device. A terminal lock instruction step of transmitting a terminal lock instruction signal for instructing the terminal lock to the communication terminal by the terminal lock instruction means of the apparatus, and transmitted from the server device in the instruction signal receiving means of the communication terminal A reception step of receiving the terminal lock instruction signal, and a release code generation step of generating a release code used to release the terminal lock based on the terminal lock instruction signal in the release code generation means of the communication terminal And the terminal lock means of the communication terminal automatically uses the release code. A terminal lock step for locking, a release code transmission step for transmitting the release code to the server device in the release code transmission means for the communication terminal, and a terminal lock instruction in the release code storage means for the server device. And a release code storing step of associating the release code transmitted from the communication terminal that has transmitted the signal with information for identifying the communication terminal.

  According to the present invention, there are provided a communication terminal, a communication system, and a terminal control method capable of reliably performing terminal lock and release of a communication terminal.

It is a block diagram which shows the function structure of the communication system which concerns on embodiment of this invention. It is a figure which shows the example of the information hold | maintained by IPSCP and TISCP. It is a figure explaining the function of the communication terminal contained in a communication system. It is a hardware block diagram of the communication terminal contained in a communication system. It is a sequence diagram explaining the terminal control method by a communication system. It is a flowchart explaining the process in a communication terminal.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a diagram illustrating a system configuration of a wireless communication system according to an embodiment of the present embodiment. A communication system 1 shown in FIG. 1 includes a user information management apparatus 10, a TISCP 20, an IPSCP 30, a DME 40, an MPN 50, an exchange 60, and a communication terminal 70. Among these, the TISCP 20, IPSCP 30, DME 40, MPN 50, and exchange 60 form a core network N1 for the communication terminal 70 to communicate. The device included in the core network N1 corresponds to the server device in the present embodiment. As described above, the server device may be configured by a plurality of device groups.

  The communication system 1 is a system that remotely operates the communication terminal 70 based on a request from the user information management apparatus 10 to execute some processing and transmits an execution result to the user information management apparatus 10. The communication terminal 70 is a terminal that is carried (possessed) by the user, and examples thereof include a mobile phone such as a smartphone and a tablet-type terminal. Further, the remote operation in the present embodiment refers to causing the communication terminal 70 to execute some processing based on an instruction from the core network N1 side without directly operating the communication terminal 70. The user information management device 10, the TISCP (Terminal Identification Service Control Point) 20, the IPSCP (IP Service Control Point) 30, the DME (Device Management Equipment) 40, the MPN (Media Processing Node) 50, the exchange 60 and the communication terminal 70 are respectively Information is transmitted and received by communication through a wireless or communication network.

  The user information management device 10 is a device that provides a service for remotely operating the communication terminal 70 to a user. Here, the service provided by the user information management apparatus 10 includes a terminal lock service that switches the communication terminal 70 from the normal use state to the lock state and restricts the use of the communication terminal 70. That is, in the communication system 1, examples of processing executed on the communication terminal 70 by remote operation include switching to a locked state. The switching to the lock state may be a part of the screen (for example, only the screen lock), such as screen lock, restriction of operation by various switches, and the like.

  In the communication system 1, the communication terminal 70 can be switched to a locked state by remote operation based on an instruction from the user information management device 10. In order to return the communication terminal 70 from the locked state to the normal state, a method in which the communication terminal 70 receives a terminal lock release instruction by remote operation from the core network N1 side, or the user A method of inputting a release code is generally used. The communication system 1 according to the present embodiment has a configuration in which a release code (password) for returning the communication terminal 70 from the locked state is prepared on the communication terminal 70 side, and this is managed on the core network N1 side.

  The TISCP 20 has a function of managing information related to the communication terminal 70 in use. In the communication system 1 of the present embodiment, when the communication terminal 70 is in the locked state, information indicating this is stored in association with information (for example, IME: terminal identification number) that identifies the communication terminal 70. Further, the release code generated by the communication terminal 70 before the communication terminal 70 is locked is also stored in association with the information specifying the communication terminal 70. That is, the TISCP 20 also has a function as a release code storage unit. The release code stored in the TISCP 20 is appropriately provided in response to a request from the user information management apparatus 10. FIG. 2 is a diagram illustrating an example in which a release code is stored in the TISCP 20. As illustrated in FIG. 2, a release code for releasing the lock state of each terminal is stored in association with the IME that specifies the communication terminal 70. In this way, the TISCP 20 holds information related to the release code of the communication terminal 70.

  The IPSCP 30 is an IP service control apparatus that has a function of holding and managing information related to subscriber users and communication terminals 70 and provides a service control function to each node. Further, the release code generated by the communication terminal 70 before the communication terminal 70 enters the locked state is stored in association with information for specifying the communication terminal 70 as in the case of the TISCP20. Specifically, the release code of the communication terminal 70 can be held in the IPSCP 30 in the format shown in FIG. That is, the IPSCP 30 also has a function as a release code storage unit.

  The DME 40 has a function of changing the setting of the communication terminal 70 by remote operation in cooperation with the TISCP 20. Examples of the remote operation contents of the communication terminal 70 performed by the DME 40 include switching to and returning to the locked state, initialization, acquisition of position information, and the like. That is, the DME 40 functions as a terminal lock instruction means for instructing terminal lock to the communication terminal 70.

  The MPN 50 has a function of providing additional services such as SMS (Short Message Service) and answering machine. When the communication terminal 70 is caused to execute some processing by remote operation, SMS is used as a remote operation start signal instructing the start. Communication for causing the communication terminal 70 to execute some processing by remote operation is standardized by OMA (Open Mobile Alliance) or the like, and it is also defined that SMS is used as a remote operation start signal. When starting the remote operation, the MPN 50 transmits an SMS to the communication terminal 70 based on an instruction from the DME 40.

  As the exchange 60 used when the communication terminal 70 performs communication, in the 3G network, an SGSN (Serving GPRS Support Node) that is an exchange for a packet exchange service and a GGSN that is an exchange that performs connection processing in the packet exchange service. (Gateway GPRS Support Node). In the LTE (Long Term Evolution) network, there is an MME (Mobility Management Entity) which is an exchange that provides mobility control, bearer control functions, and the like. Since the communication system 1 according to the present embodiment is not a system that is limited to a specific communication network, SGSN or MME will be described as the exchange 60 here.

  Next, the communication terminal 70 that characterizes the communication system 1 according to the present embodiment will be described with reference to FIGS. 3 and 4. As shown in FIG. 3, the communication terminal 70 includes a communication unit 71 (instruction signal receiving unit, release code transmission unit), a release code generation unit 72 (release code generation unit), a terminal lock unit 73 (terminal lock unit), and The release code storage unit 74 is included. As shown in FIG. 4, the communication terminal 70 physically includes a CPU 101, a RAM 102 and a ROM 103 as main storage devices, a communication module 104 as a data transmission / reception device, a hard disk, a flash memory, and the like. The computer system includes an apparatus 105, an input device 106 exemplified by a touch panel and a keyboard as input devices, an output device 107 such as a display, and the like. The communication terminal 70 operates the communication module 104, the input device 106, and the output device 107 under the control of the CPU 101 by reading predetermined computer software on hardware such as the CPU 101 and the RAM 102 shown in FIG. By reading and writing data in the RAM 102 and the auxiliary storage device 105, a series of functions in each device is realized. Hereinafter, returning to FIG. 3, the function of each unit of the communication terminal 70 will be described in detail.

  The communication unit 71 has a function of communicating with other devices. Specifically, a function of receiving a remote operation start signal from the DME 40 via the exchange 60 (in this embodiment, a terminal lock instruction signal for instructing terminal lock) and transmitting a response to the instruction from the DME 40 Have When the terminal lock is executed using the release code generated by the release code generation unit 72 to be described later, a release code used as a password for release is transmitted from the terminal to the response signal.

  When the remote operation start signal from the DME 40 is an instruction related to terminal lock, the release code generation unit 72 generates a release code as necessary. When the user of the communication terminal 70 has set a release code for returning from the terminal lock in the past, it is not necessary to newly generate a release code for returning from the locked state. On the other hand, when the user of the communication terminal 70 has not set the release code in the past, the release code generation unit 72 generates a new release code. The generation method of the release code is not particularly limited. For example, a character string can be randomly generated. Note that the release code generated by the release code generation unit 72 is a release code used temporarily. In other words, one release code is temporarily generated for one terminal lock and the terminal lock state is restored, that is, when the terminal lock is released, the use of the temporarily generated release code is stopped, Discarded.

  The terminal lock unit 73 has a function of locking the terminal when the remote operation start signal from the DME 40 is an instruction related to terminal lock. At this time, the terminal lock unit 73 sets a release code set by the user or a release code generated by the release code generation unit 72 as a password necessary for returning from the locked state.

  The cancellation code storage unit 74 has a function of storing the cancellation code set by the user or the cancellation code generated by the cancellation code generation unit 72. When the cancellation code stored in the cancellation code storage unit 74 is a character string input by the user, it is used for checking whether the character string corresponds to the cancellation code.

  Next, a terminal control method by the communication system 1 will be described with reference to FIGS. FIG. 5 is a sequence diagram for explaining a series of processing when the communication terminal 70 is locked by remote operation. FIG. 6 is a flowchart for explaining the operation of the communication terminal 70 related to terminal lock.

  As shown in FIG. 5, an instruction to lock the communication terminal 70 by remote operation is transmitted from the user information management apparatus 10 to the IPSCP 30 (S101). The instruction from the user information management apparatus 10 to put the communication terminal 70 into the locked state is, for example, when the user loses the communication terminal 70 and prevents the communication terminal 70 from being used by a third party. In addition, it is performed when the use of the communication terminal 70 is temporarily stopped by the communication carrier.

  When a terminal lock instruction for the communication terminal 70 is transmitted from the user information management device 10, the terminal information is confirmed in the IPSCP 30 (S102). Here, the location information and contract information of the communication terminal 70 are confirmed. Next, the IPSCP 30 instructs the DME 40 to transmit to the communication terminal 70 a signal for a remote control instruction for setting the own device in a locked state (S103). Based on the instruction from the IPSCP 30, the DME 40 instructs the MPN 50 to transmit the SMS corresponding to the remote operation start signal to the communication terminal 70 (DMMP: SMS-SUBMIT) (S104: terminal lock instruction step).

  Based on the instruction from the DME 40, the MPN 50 instructs the exchange 60 to transmit SMS (SMS-Push) (S105: terminal lock instruction step, reception step), so that the exchange 60 transmits to the communication terminal 70. SMS (Pkg # 0) is transmitted (S106: terminal lock instruction step). The SMS is received by the communication unit 71 of the communication terminal 70. Thereafter, after a series of communications to notify completion of SMS transmission is performed among the DME 40, the MPN 50, the exchange 60, and the communication terminal 70 (S106 to S108: terminal lock instruction step), the instruction content between the communication terminal 70 and the DME 40 Communication related to (terminal lock) (DM control: Pkg # 1 and Pkg # 2) is performed (S109, S110: terminal lock instruction step).

  Thereafter, the communication terminal 70 performs confirmation of the release code (S111: release code generation step) and terminal lock (S112: terminal lock step). The processing performed at the communication terminal 70 at this time is shown in FIG. First, the release code generation unit 72 of the communication terminal 70 checks whether a release code for releasing the terminal lock is set (S201). Whether or not a release code is set can be confirmed based on whether or not the release code is stored in the release code storage unit 74. Here, if the release code has already been set, that is, if the release code has been registered by the user (YES), it is determined that the release code set by the user is used as the terminal unlock password (S202). ). On the other hand, when the release code is not set by the user (NO), the release code generation unit 72 generates a temporary release code (temporary release code) (S203). Thereafter, the terminal lock unit 73 locks the terminal (S204). As described above, the terminal lock using the release code as the password is performed (S111 and S112 in FIG. 5). As a result, the operation of the communication terminal 70 is restricted.

  After the terminal lock of the communication terminal 70 is performed, communication is performed between the communication unit 71 of the communication terminal 70 and the DME 40 to notify that the terminal lock process has been completed (S113, S114: release code transmission step). At this time, if the release code (temporary release code) generated by the communication terminal 70 is used when the communication terminal 70 is locked, the temporary release code is used as the release code from the communication terminal 70 to the DME 40. Be notified. When a release code set by the user is used for terminal lock, the release code may be notified to the DME 40, that is, the core network N1 side, or may not be notified. If the user has set a release code, it is considered that the user has stored the release code, so even if the core network N1 does not hold the information, the user can use the release code. Because it can. Therefore, from the viewpoint of improving security, it is preferable that the release code set by the user is not transmitted to the core network N1 side.

  The DME 40 notifies the IPSCP 30 that the operation related to the terminal lock of the communication terminal 70 is completed (S115). At this time, if there is a temporary release code, it is also notified to the IPSCP 30. Next, the IPSCP 30 notifies the user information management apparatus 10 that the terminal lock has been completed in response to the terminal lock instruction (S101) (S116). At this time, if there is a temporary release code, it is also notified.

  Thereafter, the user information management apparatus 10 notifies the TISCP 20 that the target communication terminal 70 has become a terminal locked state (S117). At this time, the temporary release code generated by the communication terminal 70 is also transmitted to the TISCP 20. The TISCP 20 stores that the communication terminal 70 is in a terminal locked state based on information from the user information management device 10, holds a temporary release code in association with information specifying the communication terminal 70, and 70 is updated (S118: release code storage step). Further, the information of the communication terminal 70 including the temporary release code is transmitted from the TISCP 20 to the IPSCP 30 (S119), and the information related to the communication terminal 70 is updated (S120: release code storage step). Then, the result is transmitted from IPSCP 30 to TISCP 20 (S121), and the process related to the terminal lock ends.

  In the process so far, the temporary release code generated in the communication terminal 70 is not notified to the user. Therefore, in order for the user to release the locked state of the communication terminal 70, it is necessary to obtain a temporary release code. Here, since the temporary release code is also notified to the user information management apparatus 10 (S116), the user information management apparatus 10 may be configured to hold the temporary release code. The configuration may be such that the temporary cancellation code is acquired from the TISCP 20 by making an inquiry to the TISCP 20 based on a request from the user (S122) without being configured to hold the temporary cancellation code. With such a configuration, the user can acquire a temporary release code via the user information management apparatus 10 and release the terminal lock of the communication terminal 70 using the temporary release code.

  The effect by the terminal control method by the communication system 1 which concerns on this embodiment is demonstrated. When the communication terminal 70 is remotely operated by the communication system 1 described above, the execution of processing is instructed to the communication terminal 70 using SMS as described above. The communication related to the remote operation is standardized by OMA (Open Mobile Alliance) or the like. Then, the communication terminal 70 executes processing designated by the SMS such as terminal lock in response to the reception of the SMS.

  The remote operation of the communication terminal 70 is performed when the communication terminal 70 receives the SMS that is a remote operation start signal. Therefore, when the terminal lock of the communication terminal 70 is released by remote operation, the core network N1 transmits an SMS instructing the terminal lock release to the communication terminal 70, and the communication terminal 70 receives this. Thus, the process is executed.

  Here, in order to receive the SMS at the communication terminal 70, it is necessary to secure a memory area of a predetermined size (for example, 1 MB) due to restrictions on the OS (Operating System) side of the communication terminal 70. Therefore, when the terminal of the communication terminal 70 is locked by receiving the SMS, in order to release the terminal lock of the communication terminal 70 by remote operation, it is necessary to receive the SMS that is a remote operation start signal related to the release. .

  As a method of releasing the terminal lock of the communication terminal 70 without performing a remote operation, a method in which a user inputs a release code used at the time of terminal lock to the communication terminal 70 has been conventionally used. However, in the conventional terminal lock method, when the user has set a release code in advance, the terminal is locked using a temporary release code randomly generated in the communication terminal 70. However, the temporary release code randomly generated by the communication terminal 70 is held only by the communication terminal 70 and is not transmitted to the core network N1 side. Therefore, the specification that the user cannot know the release code generated by the communication terminal 70 and the terminal lock cannot be released by inputting the release code is general. The reason why such a specification has been common is that it has not been assumed that SMS cannot be received.

  In the conventional method of using the communication terminal 70, it has been considered that the memory of the communication terminal 70 is not used until a memory area necessary for receiving the SMS is lost. It was not supposed to leave. However, in recent methods of using the communication terminal 70, since the user has increased the chance of downloading data via the network, the memory area for receiving the SMS without the user's knowledge is lost. Events that use memory may occur. Further, in the case where the communication terminal 70 is lost, there is a possibility that the memory of the communication terminal 70 may be disabled until a malicious third party can no longer receive SMS. In this case, since the communication terminal 70 cannot receive the SMS as a remote operation start signal that triggers execution of processing in the communication terminal 70 by remote operation, the communication terminal 70 is unlocked by remote operation. There is a possibility that it cannot be done.

  When the user sets a release code in advance, as described above, unlocking by direct input of the release code by the user is possible. However, according to the conventional specification, when the user has not set the release code, the user cannot know the temporary release code generated when the terminal is locked. Therefore, when the communication terminal 70 cannot receive the SMS instructing to release the terminal lock, it is necessary to initialize the communication terminal 70 in order to use the communication terminal 70 again. As described above, since the temporary release code is held only on the communication terminal 70 side, there is a possibility that the terminal lock of the communication terminal 70 cannot be reliably released.

  On the other hand, in the communication system 1 including the communication terminal 70 according to the present embodiment, the temporary release code generated in the release code generation unit 72 of the communication terminal 70 is transmitted to the core network N1 side and held in the TISCP 20 and the IPSCP 30. By adopting such a configuration, the temporary release code other than the communication terminal 70 is held. Therefore, even if the SMS for terminal lock release cannot be received and the terminal lock cannot be released only by the communication terminal 70, the user can acquire the temporary release code from the core network N1 side. The user can directly enter the temporary release code to release the terminal lock. Therefore, even if the communication terminal 70 cannot receive the SMS, the terminal lock can be particularly reliably released.

  Further, as in the communication system 1 described above, when the release code is set in advance by the user, the release code is used, and when the release code is not set, the release code generation unit 72 uses the temporary release code. The terminal is locked using the cancellation code set by the user or the temporary cancellation code generated by the cancellation code generation unit 72, and the cancellation code used for terminal locking is transmitted from the communication terminal 70 to the core network N1 side. By transmitting the data to the DME 40 and storing it in the TISCP 20 and the IPSCP 30, when the cancellation code is set by the user, the cancellation code is not generated, and the processing amount in the communication terminal can be reduced.

  Furthermore, when the release code is set by the user, the release code is not transmitted to the core network N1 side, and the release code is generated when the release code is generated by the release code generation unit 72. The set release code is not transmitted from the communication terminal to the outside, so that security is improved and the amount of communication between the communication terminal and the server device on the core network N1 side can be reduced.

  As mentioned above, although preferred embodiment of this invention was described, the communication system 1 which concerns on this invention can perform a various change.

  In the above embodiment, the communication terminal 70 is configured not to generate the release code when the release code is set in advance by the user. However, when the terminal of the communication terminal 70 is locked by remote operation, The cancellation code generation unit 72 may generate a temporary cancellation code uniformly. In this case, there is no need to set a release code in advance by the user, and a temporary release code for single use is generated by the communication terminal 70 every time the terminal is locked by remote operation, and the terminal lock is used using this temporary release code. It is possible to adopt a mode in which it is performed and transmitted to the core network N1 side.

  DESCRIPTION OF SYMBOLS 1 ... Communication system, 10 ... User information management apparatus, 20 ... TISCP, 30 ... IPSCP, 40 ... DME, 50 ... MPN, 60 ... Exchange, 70 ... Communication terminal, 71 ... Communication unit, 72 ... Release code generation unit, 73 ... Terminal lock unit, 74 ... Release code storage unit.

Claims (4)

A communication system configured to include a server device and a communication terminal, and to perform terminal lock of the communication terminal by remote operation by the server device,
The server device
Terminal lock instruction means for transmitting a terminal lock instruction signal instructing the terminal lock to the communication terminal;
A release code storage means for associating a release code used for releasing the terminal lock transmitted from the communication terminal that has transmitted the terminal lock instruction signal with information identifying the communication terminal;
With
The communication terminal is
Instruction signal receiving means for receiving the terminal lock instruction signal transmitted from the server device;
A release code generating means for generating a release code based on the terminal lock instruction signal;
Terminal lock means for locking the own machine using the release code;
Cancellation code transmitting means for transmitting the cancellation code to the server device;
Equipped with a,
The release code generation means determines whether the release code is set in advance by a user, and generates a temporary release code if the release code is not generated in advance,
The terminal lock means locks the device using the release code or the temporary release code,
When the temporary release code is generated, the release code transmitting means transmits the temporary release code as a release code to the server device . The cancellation code transmitting means does not transmit the cancellation code to the server device when the cancellation code is set in advance by the user, and when the temporary cancellation code is generated, communication system according to claim 1, wherein the transmitting to the server device a release code as a release code. A communication terminal that locks its own terminal by remote operation by a server device,
Instruction signal receiving means for receiving a terminal lock instruction signal transmitted from the server device;
Based on the terminal lock instruction signal, a release code generating means for generating a release code used for releasing the terminal lock;
Terminal lock means for locking the own machine using the release code;
Cancellation code transmitting means for transmitting the cancellation code to the server device;
Equipped with a,
The release code generation means determines whether the release code is set in advance by a user, and generates a temporary release code if the release code is not generated in advance,
The terminal lock means locks the device using the release code or the temporary release code,
The cancellation code transmitting means, when the temporary cancellation code is generated, transmits the temporary cancellation code as a cancellation code to the server device . A terminal control method by a communication system, comprising a server device and a communication terminal, and performing a terminal lock of the communication terminal by a remote operation by the server device,
A terminal lock instruction step of transmitting a terminal lock instruction signal instructing the terminal lock to the communication terminal by the terminal lock instruction means of the server device;
In the instruction signal receiving means of the communication terminal, a receiving step of receiving the terminal lock instruction signal transmitted from the server device;
In the release code generation means of the communication terminal, based on the terminal lock instruction signal, a release code generation step of generating a release code used for releasing the terminal lock;
In the terminal lock means of the communication terminal, a terminal lock step of locking the own device using the release code;
In the cancellation code transmission means of the communication terminal, a cancellation code transmission step of transmitting the cancellation code to the server device;
In the release code storage means of the server device, a release code storage step of associating the release code transmitted from the communication terminal that has transmitted the terminal lock instruction signal with information identifying the communication terminal;
I have a,
In the release code generation step, it is determined whether the release code is set in advance by the user, and if the release code is not generated in advance, a temporary release code is generated,
In the terminal lock step, lock the device using the release code or the temporary release code,
In the release code transmitting step, when the temporary release code is generated, the temporary release code is transmitted as a release code to the server device .

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