| 摘要 |
Access to a remotely-controlled device by authorized users is assured even if the device is accessed by an unauthorized user over a network. The remote control relay device 20 is connected between a network and a device 30 that is remotely controlled from an external device 10 over the network 16. A communication control unit 21 exchanges control data with the external device over the network. Storage memory 24 stores control data, and control memory 25 stores control data used for external device authentication. A write control unit 22, 28 controls sending and receiving control data by the communication control unit, reads control data stored in the storage memory, and writes control data to the control memory. The write control unit reads and writes control data from the storage memory to the control memory only in response to off-line operations that are not executed over the network. <IMAGE>
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