| 摘要 |
<P>PROBLEM TO BE SOLVED: To control a second device safely against menaces such as impersonation and leakage of a control instruction in a system constituted of three devices of the second device having a communication function, a third device connectable to the second device, and a first device capable of communicating the second device. <P>SOLUTION: The first device transmits an instruction to request issue of a control instruction to the second device, to the third device through the second device, and the third device generates the control instruction to the second device and transmits the control instruction to an instruction execution means of the second device, and the second device executes the instruction by the means. Thus the first device controls the second device without leaking control instructions including remote control instructions, so that a device control system of high safety which secures completeness of data can be established. <P>COPYRIGHT: (C)2004,JPO |
