KR100494429B1 - Relay apparatus for pc remote driving and remote controlling method thereof - Google Patents

Abstract

       The present invention relates to a relay device for remotely operating a PC and a remote control method using the same, and remotely controlling a host PC at a remote location based on information from the relay device after connecting the relay device to a host PC installed at a certain point. On the other hand, it is possible to remotely control the on / off state of the host PC by remotely using the relay device connected to the host PC, and the relay device for remote operation and remote control method using the same. In order to provide a host, a host PC embedded with a LAN card and a remote control program is installed at a predetermined place, and a guest PC (external PC, laptop computer, personal information terminal, etc.) is connected to a remote site separated from the host PC through an internet network. In the state, connected to the host PC to remotely control the host PC through the guest PC Repeater; The DHCP client unit receives and sets an IP address from an ISP's DHCP server, and stores the IP address assigned by the DHCP client unit in a PC address storage unit, and reports the request through the Internet when requested by the guest PC. Dynamic IP processing unit and the connection request from the guest PC in the TCP socket daemon standby state checks the on / off status of the connected host PC and transmits the status, the host PC at the request of the guest PC A PC on / off receiver for generating an on / off request signal, and a predetermined current signal is generated according to a command of the PC on / off receiver to turn on or off the host PC, or WOL (Wake up on LAN) A PC on / off signal processor for broadcasting a signal to connected host PCs to turn the host PC on and off, and any client A packet relay processing unit for cooperatively transmitting In / Out network packets transmitted from the packet in a 1: 1 or 1: N manner, a packet routing unit for routing all data transmitted / received through the Internet to a connected PC, and the host PC. At the same time, it is configured to include a DHCP server unit for distributing private IP.

Description

RELAY APPARATUS FOR PC REMOTE DRIVING AND REMOTE CONTROLLING METHOD THEREOF}

       The present invention relates to a relay device for remotely driving a PC and a remote control method using the same, and more particularly, after connecting a relay device to a host PC installed at a predetermined place, the host device is connected to a remote device through the relay device. The present invention relates to a repeater for remotely driving a PC and to a remote control method using the same to selectively drive and remotely control a PC.

       In general, as computer-related technologies such as microprocessors, memory devices, and various hardware are developed, high performance of PCs is being achieved. Also, with the development of corresponding software technologies, in recent years, homes, schools, companies, etc. Most of the work, from the creation of documents to professional work in various fields, is performed using a PC.

       In particular, in recent years, with the rapid development of the Internet, the application range of the PC has become wider and the communication speed has increased rapidly. Such an increase in the communication speed can be achieved by accessing a host PC installed at a certain point even at a remote location. It is possible to provide an environment that can be downloaded or uploaded, or to control and use the host PC installed at a certain point by using a predetermined control program even from a remote location.

       On the other hand, Figure 1 is a configuration diagram showing a remote control system of a general host PC, a predetermined remote control program is embedded in each of the host PC 20 and the arbitrary guest PC 40 installed at a certain point.

       The host PC 20 waits for a connection from the arbitrary guest PC 40 while the remote control program is driven.

       At this time, after the user drives the remote control program of the guest PC 40, and enters the IP address or host name of the host PC 20 to connect to the host PC 20, the host PC 20 converts the screen state into its own data format under the control of the remote control program and transmits the screen state to the remote control program side of the guest PC 40.

       In addition, the remote control program of the guest PC 40 displays the state on the basis of the data transmitted from the host PC 20 through the monitor of the guest PC 40, so that the user can access the host PC through the displayed screen. 20 can be controlled remotely.

       However, in the conventional remote control system configured as described above, since the remote control program for remote control of the host PC should be installed in both the host PC and the guest PC, the program installation process of the guest PC is additionally required, and thus there is no need for it. In addition to the addition of cost and cost, security problems, and the like, when a large amount of data is exchanged, a time and cost unreasonable problem occurs, causing a user inconvenience.

       In addition, when the host PC is remotely controlled using the guest PC, the host PC should always be turned on, resulting in a waste of power, resulting in a problem of low economical efficiency. In case of using Wake up on LAN (WOL), it is possible to control the power of the host PC remotely, but this is by using the static IP address assigned to the PC. Under the circumstances, a problem arises in that power control is impossible.

       Accordingly, the present invention has been made to solve the above-described problems, the object of which is to efficiently connect a host PC to a remote host PC based on information from the relay device after connecting the relay device to a host PC installed at a certain point. It is to provide a relay device for remote control of the PC and a remote control method using the same to enable remote control.

       In addition, another object of the present invention is to use a relay device connected to the host PC remote control device for remote control of the PC and to remotely control the on / off state after determining the power state of the host PC at a remote location It is to provide a control method.

       In order to achieve the above object, according to the present invention, a host PC with a LAN card and a remote control program is installed at a predetermined place, and a guest PC (external PC, notebook) is installed at a remote location separated from the host PC through an internet network. A computer connected to the host PC to remotely control the host PC through the guest PC while the computer, personal information terminal, etc.) are connected; The DHCP client unit receives and sets an IP address from an ISP's DHCP server, and stores the IP address assigned by the DHCP client unit in a PC address storage unit, and reports the request through the Internet when requested by the guest PC. Dynamic IP processing unit and the connection request from the guest PC in the TCP socket daemon standby state checks the on / off status of the connected host PC and transmits the status, the host PC at the request of the guest PC A PC on / off receiver for generating an on / off request signal, and a predetermined current signal is generated according to a command of the PC on / off receiver to turn on or off the host PC, or WOL (Wake up on LAN) A PC on / off signal processor for broadcasting a signal to connected host PCs to turn the host PC on and off, and any client A packet relay processing unit for cooperatively transmitting In / Out network packets transmitted from the packet in a 1: 1 or 1: N manner, a packet routing unit for routing all data transmitted / received through the Internet to a connected PC, and the host PC. At the same time, it is configured to include a DHCP server unit for distributing private IP.

       On the other hand, in the remote control method using a relay device for remote operation of the PC of the present invention, the relay device is available by performing communication with a DHCP server of the carrier (ISP) in the state that the relay device is connected to the host PC installed in a certain place A first step of receiving and storing an IP address, and a second step of checking a state of a host PC by accessing the relay device by receiving a corresponding IP address information after an arbitrary guest PC installed at a remote site passes a predetermined authentication process And the relay device drives the power supply unit of the host PC and allocates an available IP address according to a request for PC ON information from the guest PC, while the host PC is remotely connected through the guest PC through a remote control program. According to a third process of connecting to the controllable state and the termination signal of the guest PC in the remote control state of the guest PC and the host PC After the host PC DHCP client to release the IP address and stored by transmitting the status information to the relay device, the relay apparatus is characterized by comprising a fourth step of transmitting the information to the PC off the guest PC.

       According to the present invention made as described above, after connecting the relay device to the host PC installed at a certain point, the overall remote including the on and off of the host PC through any guest PC installed at a remote location via the relay device A control environment in which control can be established is established.

       Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

       2 is a configuration diagram showing a host PC remote control system connected to a relay device for remote PC drive according to the present invention, Figures 3a and 3b is a state in which the relay device for PC remote drive according to the present invention is connected to the host PC 4 is a block diagram illustrating an internal configuration of a relay device for remotely driving a PC according to the present invention. As shown therein, the host for remote driving of the host PC 20 according to the present invention. The relay device 60 connected to the PC 20 includes a power switch 32 provided in the PC case 30 of the host PC 20 and a power switch connection terminal 24 provided on the motherboard 22. A switch relay 62 is provided to correspond to each other and to control the on / off state by applying a constant current signal to the host PC 20. In addition, a PC network connection port 64 and a WAN connection are provided. Network port 66 is provided to be connected to the Internet connection modem 50 for connection with the LAN card 26 and the Internet network 10 coupled to the motherboard 22 of the host PC 20, respectively.

       In this case, when the control of the host PC 20 through the relay device 60 is performed in a WOL (Wake up on LAN) method, it is preferable that a LAN card having an automatic booting function is supported in the host PC 20.

       In the drawing, reference numeral 12 denotes a DHCP server of an ISP which searches for an assignable IP and transmits the IP to the relay 60 as the power of the relay 60 turns on. 90 is a PC address storage unit installed on the Internet so that the relay device 60 can store the IP address provided from the DHCP server 12.

       In the internal configuration of the relay device 60, the DHCP client unit 70, the dynamic IP processing unit 72, the PC on / off signal receiving unit 74, the PC on / off signal processing unit 76, and the packet The relay processing unit 78, the packet routing unit 80, the DHCP server unit 82 and the like is configured.

       At this time, the DHCP client unit 70 is an IP address available from the ISP DHCP server 12 while the relay device 60 is connected to the Internet network 10 via the Internet connection modem 50. And the setting is performed, and the dynamic IP processing unit 72 is connected to the corresponding IP address provided by the DHCP client unit 70 from the DHCP server 12 of the communication company through the Internet network 10. It reports to the PC address storage unit 90 and serves to be stored in the database (DB) 92.

       The PC on / off signal receiving unit 74 waits with the TCP socket daemon, and when the connection request of the client program is input from the guest PC 40 installed at any remote location, the host PC connected with the relay device 60. When the on / off state of the 20 is checked and the on / off request of the host PC 20 is input from the guest PC 40, the command signal is sent to the PC on / off signal processor 76. To the side.

       The PC on / off signal processor 76 switches to the power switch connection terminal 24 of the motherboard 22 of the host PC 20 according to the command signal from the PC on / off signal receiver 74. The host PC 20 is turned on and off by applying a predetermined current signal through the relay 62 or by broadcasting a WOL signal to the connected PCs.

       In addition, the packet relay processing unit 78 performs a cooperative transmission of In / Out network packets transmitted from a plurality of client sockets in a 1: 1 or 1: N manner, and the packet routing unit 80 is an Internet network ( 10) to route all data transmitted and received through the host PC 20 is connected.

       The DHCP server 82 distributes a private IP when the host PC 20 is driven.

       On the other hand, the relay device for remote PC drive according to the present invention, as shown in Figure 3a, after configuring a PCI slot (not shown) in the relay device 60, the motherboard 22 of the host PC 20 It may be manufactured in a built-in form so as to be connected to the state mounted on the) to be integrally coupled to the inside of the PC, as shown in Figure 3b, the power supply 68 on one side of the repeater 60 Of course, it can be manufactured in an external form that is operated by receiving a predetermined power from the outside.

       Next, the operation of the relay device for remote PC driving according to the present invention made as described above will be described with reference to FIGS.

       In this case, the optional guest PC 40 provided at a remote location may optionally be equipped with hardware such as a USB device (not shown) employing a remote control program for remotely controlling the use environment of the host PC 20. Of course, it can be used.

       First, the remote control of a PC using the relay device 60 is a DHCP server of a communication company (ISP) in the state in which the relay device 60 is connected to a host PC 20 installed at a predetermined place. The relay device 60 receives the available IP address by communicating with the communication device 12 and stores the received IP address, and receives the corresponding IP address information after the predetermined guest PC 40 installed in the remote place undergoes a predetermined authentication process. In response to the process of checking the state of the host PC 20 by connecting to the PC ON information request from the guest PC (40), the repeater 60 drives the power supply of the host PC 20 and available While assigning an IP address, the host PC 20 is connected to the remote control possible state through the guest PC 40 through a remote control program, and the guest PC 40 and the host PC 20 The guest PC 40 in the remote control state of In response to the termination signal, the DHCP client of the host PC 20 releases the IP address and transmits the state information to the relay device 60 so that the relay device 60 stores the PC off information. 40) the process of transmitting to the side.

       Here, the process in which the relay device 60 connected to the host PC 20 installed in a certain place to communicate with the DHCP server 12 of the communication company (ISP) is shown in Figure 5, the host PC ( When a predetermined power is supplied to the relay device 60 connected to 20) (step 100), the relay device 60 drives the DHCP client unit 70 through the Internet connection modem 50 and the Internet network 10. The DHCP server 12 of the ISP to be connected is requested to allocate an available IP address (step 110). Accordingly, in step 120, the DHCP server 12 of the ISP is available. Search for and assign to the repeater 60 side.

       In addition, the relay device 60 having received the available IP address transmits the available IP address information allocated in step 130 to the PC address storage unit 90 connected through the Internet network 10 to the PC address storage unit ( 90), and then proceeds to step 140 to maintain the signal waiting state.

       In addition, a process in which any guest PC 40 is initially connected through the relay device 60 connected to the host PC 20 to check the state of the host PC 20 may be performed at a remote location, as shown in FIG. 6. After the application of any installed guest PC 40 is driven (step 200), when the guest PC 40 is connected to the PC address storage unit 90 connected through the Internet network 10 (step 210). The guest PC 40 requests client authentication to the PC address storage unit 90 and requests corresponding IP address information of the relay device 60 (step 220).

       In addition, in response to the client authentication request in step 220, if the PC address storage unit 90 performs the authentication procedure of the guest PC 40 and determines that the guest PC 40 is an authenticated client, in step 230. In step 240, the PC address storage unit 90 reads the IP address of the relay device 60 from the database 92 and transmits the IP address to the guest PC 40.

       In addition, the guest PC 40 that has received the IP address of the relay device 60 requests a network connection to the relay device 60 based on the IP address information (step 250). In step 260, the relay device 60 determines whether the client is an authenticated client by performing a predetermined authentication procedure, and if the client is an authenticated client, accepts the request and uses the information stored in its DHCP server unit 82 to connect. Information related to the connection state of the host PC 20 (host PC name and on / off state of the host PC, etc.) is extracted and transmitted to the guest PC 40 (step 270). The guest PC 40 displays the information of the host PC 20 received from the relay device 60 to the user.

       On the other hand, the guest PC 40 is connected to the relay device 60 receives the status information of the host PC 20 and then connected to the host PC 20 in a state capable of remote control is shown in Figure 7 As shown in FIG. 1, if the host PC 20 is determined to be in an OFF state based on the information transmitted from the relay device 60 in step 300, the guest PC 40 is determined in step 310. The on request information of the host PC 20 is transmitted, and thus the PC on / off signal receiver 74 of the relay device 60 requests the PC on request from the guest PC 40. The information is received to determine the PC ON method (step 320 and step 330).

       In this case, when the PC on method is a switch relay method, the process proceeds to step 332 where the PC on / off signal processing unit 76 of the repeater 60 generates a constant current signal and then outputs the current signal to the switch relay unit ( 62 is applied to the motherboard 22 power switch connection terminal 24 of the host PC 20 to drive the host PC 20 (step 334).

       In addition, when the PC on method is the WOL method in step 330 (step 340), the PC on / off signal processor 76 of the relay device 60 uses the MAC address of the host PC 20 to perform magic. By broadcasting the packet signal (step 342), the host PC 20 is driven by the magic packet signal (step 344).

       On the other hand, after the host PC 20 is driven through the step 334 or 344, the DHCP client of the host PC 20 is driven in step 350 (step 350), which is available to the relay device 60. The IP address is requested and then set to an available IP address transmitted from the relay device 60 according to the request (step 360).

       Then, in step 370, the host PC 20 drives the PC screen remote control and file transfer host module, and then transmits the PC screen remote control possible information to the guest PC 40 through the relay device 60. In step 390, the guest PC 40 receives the PC-on completion information and informs the user of the status, thereby allowing the user to drive the PC screen remote control and file transfer program of the guest PC 40. In step 390, the host PC 20 is connected to the remote PC through the guest PC 40 in a state capable of remote control (step 392).

       On the other hand, the process of the remote control between the guest PC 40 and the host PC 20 is terminated, as shown in Figure 8, when the PC screen remote control and file transfer program of the guest PC 40 is terminated ( In step 410, the OFF method of the host PC 20 is determined in step 410. When the OFF method of the host PC 20 is a switch relay method (step 420), the process proceeds to step 422. The guest PC 40 transmits the selection information of the host PC 20 to be turned off and the PC off request information to the relay device 60, and the PC on / off receiver 74 of the relay device 60 sends the guest. After receiving the corresponding information from the PC 40 (step 424), in step 426, the PC on / off signal processing unit 76 of the relay device 60 passes through the switch relay 62 to the host PC 20 mother. The predetermined current signal is transmitted through the power switch connecting terminal 24 of the board 22. , So that the host PC (20) in Step 428 is performed a termination process of the PC by an applied current signal.

       In addition, when it is determined that the OFF method of the host PC 20 is a WOL method as a result of the determination of step 410, the host PC 20 performs a system shutdown operation in step 430.

       After the system shutdown of the host PC 20 is performed in step 428 or 430, the DHCP client of the host PC 20 releases an IP address in step 440. The DHCP server 82 of 60 stores the off state information of the host PC when the IP address of the host PC 20 is released, and transmits the information to the guest PC 40.

       In addition, as the guest PC 40 that has received the off-completion information of the host PC 20 from the relay device 60 in step 460 terminates the client program, the guest PC through the relay device 60 ( A series of processes relating to the remote control of the host PC 20 of 40 is completed.

       At this time, the relay device 60 that transmits the PC off completion information according to the termination of the host PC 20 maintains the standby state again.

       On the other hand, even if the modified embodiments other than the contents described in the present invention should not be understood individually from the technical spirit or prospects of the present invention, of course, it will fall within the claims attached to the present invention.

       According to the present invention made as described above, by connecting the relay device for PC remote drive to the host PC side and connected to the relay device via a personal PC or laptop computer and personal information terminal at a remote location, even from the outside As well as the effect of using the host computer as it is, as well as the complicated authentication process and program installation can be eliminated, there is an effect that can solve the problem in the existing PC remote control system.

       In addition, since the relay device has an on / off control function of the host PC, the relay device overcomes the problem of having to turn on the host PC in advance according to the remote control, as well as damages the PC and consumes electricity. Prevent economically useful effects.

       In addition, even in a dynamic IP address usage environment, a user can easily access a PC via a relay device to remotely control the PC. Therefore, the user's satisfaction can be maximized by providing the user with simplicity, speed and convenience. Through the advantages described above, there is a very useful effect that can be applied to various fields in the network industry.

       On the other hand, by mounting the relay device for remote control of the PC according to the present invention inside the PC configured to be integrated with the PC, the user of the PC configured with the relay device provides a high quality service differentiated from the general PC In addition to being able to be provided, the consumer's desire to buy is increased accordingly, thereby increasing the sales on the seller side of the PC.

       1 is a configuration diagram showing a remote control system of a general host PC;

      Figure 2 is a block diagram showing a host PC remote control system connected to a relay device for remote PC drive in accordance with the present invention,

      3A and 3B are views schematically showing a state in which a relay device for remotely driving a PC according to the present invention is connected to a host PC;

      4 is a block diagram showing an internal configuration of a relay device for remotely driving a PC according to the present invention;

      5 is a flowchart illustrating a process of performing communication with a DHCP server of a communication company in a state in which a relay device for remotely driving a PC according to the present invention is connected to a host PC;

      6 is a flowchart illustrating a process in which a relay device for remotely driving a PC is connected to an arbitrary guest PC according to the present invention;

      7 is a flowchart illustrating a process in which a guest PC connected through a relay device for remotely driving a PC turns on a host PC and performs remote control according to the present invention;

      8 is a flowchart illustrating a process in which a guest PC connected through a relay device for remotely driving a PC releases a connection with a host PC according to the present invention.

       Explanation of symbols on main parts of drawing

       10: Internet network, 12: carrier's DHCP server,

       20: host PC, 22: motherboard,

       24: power switch connection terminal, 26: LAN card,

       30: PC case, 32: power switch,

       40: guest PC, 50: internet connection modem,

       60: repeater, 62: switch relay,

       64: PC network connection port, 66: WAN connection network port,

       68: power supply unit, 70: DHCP client unit,

       72: dynamic IP processing unit, 74: PC on / off signal receiving unit,

       76: PC on / off signal processor, 78: packet relay processor,

       80: packet routing section, 82: DHCP server section,

       90: PC address storage, 92: database.

Claims (10)

       The host PC with a built-in LAN card and a remote control program is installed at a predetermined place, and the guest PC (external PC, notebook computer, personal information terminal, etc.) is connected to the remote site separated from the host PC through the Internet network. The relay device connected to the host PC to remotely control the host PC through the PC;        A DHCP client unit that receives and sets an IP address from a DHCP server of a carrier (ISP),        A dynamic IP processing unit storing the IP address assigned by the DHCP client unit in a PC address storage unit and reporting the request via the Internet network at the request of the guest PC;        When a connection request is received from the guest PC in the TCP socket daemon standby state, it checks the on / off status of the connected host PC and transmits the status, while requesting the on / off request signal of the host PC according to the request of the guest PC. A PC on / off receiver to generate,        The host PC is turned on or off by generating a predetermined current signal according to a command of the PC on / off receiver, or by broadcasting a WOL (Wake up on LAN) signal to the connected host PCs. A PC on / off signal processing unit for turning off;        A packet relay processing unit for cooperatively transmitting In / Out network packets transmitted from an arbitrary client socket in a 1: 1 or 1: N manner,        A packet routing unit for routing all data transmitted and received through an internet network with a connected PC;        And a DHCP server unit configured to distribute a private IP when the host PC is driven.        The method of claim 1,        The repeater        A pair of switch relays corresponding to the power switch of the PC case and the power switch of the motherboard, respectively,        PC network connection port connected to correspond to the LAN card coupled to the motherboard,        Repeater device for remote PC drive, characterized in that the WAN connection network port is connected to correspond to the Internet connection modem for connection to the Internet network.        The method according to claim 1 or 2,        The relay device is a repeater device for remote PC drive, characterized in that configured to be integrated with the PC is installed in a built-in state of the host PC in a state where a predetermined slot is formed.        The method according to claim 1 or 2,        The relay device is a relay device for remote PC drive, characterized in that the power unit is configured to receive a predetermined power from the outside is installed externally to the host PC.        In the state that the relay device is connected to a host PC installed at a certain place, the relay device communicates with a DHCP server of an ISP and receives and stores an available IP address;        A second process of checking a state of a host PC by accessing the relay device by receiving a corresponding IP address information after an arbitrary guest PC installed at a remote site passes a predetermined authentication process;        In response to a request for PC ON information from the guest PC, the relay device drives the power supply of the host PC and allocates an available IP address, while the host PC can be remotely controlled through the guest PC through a remote control program. A third process leading to a state,        According to the termination signal of the guest PC in the remote control state of the guest PC and the host PC, the DHCP client of the host PC releases the IP address and transmits the state information to the relay device so that the relay device is stored. And a fourth process of transmitting information to the guest PC.        The method of claim 5,        The first process may include driving a DHCP client unit of the relay device to request an available IP address from a DHCP server of the telecommunications company (ISP);        Assigning the retrieved IP address to the relay device by the DHCP server of the telecommunication company (ISP) after searching for an available IP address;        The dynamic IP processing unit of the relay device remote control method using a relay device for remote PC drive, characterized in that the step of reporting the assigned IP address to the PC address storage side and switching to the signal standby state.        The method of claim 5,        The second process may include requesting an IP address of the relay device by accessing a PC address storage unit on the Internet while any guest PC application is running;        The PC address storage unit after the authentication process of the guest PC and reading the stored IP address received from the relay device from the database and transmitting to the guest PC side,        The guest PC accesses the relay device according to the information of the transmitted IP address, while the relay device detects the on / off state of the connected host PC according to the information of the DHCP server unit and transmits it to the guest PC side;        Receiving the PC status, the guest PC remote control method using a relay device for remote PC drive, characterized in that the step consisting of displaying the status to the user.        The method of claim 5,        The third process may include receiving PC on request information of the guest PC from a PC on / off receiver of the relay device;        The relay device generates a predetermined signal and transmits it to the host PC to drive the power and DHCP client of the host PC;        In response to a DHCP client request from the host PC, the DHCP server of the relay device transmits an available IP address to the host PC, and the host PC drives a PC screen remote control and a file transfer host module and relays the status. Transferring to the guest PC side via the device,        The guest PC having received the status of the host PC informs the user of the status information and remotely controls the PC screen by operating a file transfer program and the host PC, wherein the remote control is possible. Remote control method using repeater for driving.        The method of claim 8,        The method of driving a power supply of a host PC through the relay device may include a switch relay method of controlling a motherboard power switch terminal of the host PC by generating a constant current signal by the PC on / off signal processor of the relay device. A remote control method using a relay device for remote PC driving, characterized in that the PC on / off signal processing unit of the device is made of a WOL method to broadcast the magic packet signal using the MAC address of the host PC.        The method of claim 5,        In the case of the switch relay method in the fourth process, the step of transmitting the PC off information to the relay device in accordance with the remote control of the screen and the file transfer program of the guest PC,        Transmitting the received information to the PC on / off processing unit so that a constant current signal is applied to a power switch terminal of the host PC motherboard;        The host PC performs a termination process according to the current signal, and the DHCP client releases the IP address and transmits the information to the DHCP server unit of the relay device so that the state is stored.        As the relay device transmits the off information of the host PC to the guest PC side, the guest PC notifies the user of the status and terminates the client program, the remote control using a relay device for PC remote drive, characterized in that Way.