To make it possible to know a state by a predetermined function on the remote terminal side by implementing miniaturization and cost reduction of a control unit, and taking the state of a local terminal by the predetermined function in the remote terminal with real time.
This communication system is equipped with local terminals A having a predetermined function and a returning function for returning the state by the predetermined function as a response according to a demand from a local network LN1, a remote terminal B having an operation input function, a transmitting and receiving function for transmitting a demand corresponding the operation via an external network EN1, and receiving a response to the demand from the EN1, and an information outputting function for outputting information obtained from the response, and a control unit C having a gate way function for receiving a demand sent from the remote terminal B via the EN1, transmitting it to the local terminals A via the LN1, receiving responses returning from the local terminals via the LN1, and transmitting them to the remote terminal B via the EN1.
SAKAMOTO HIDEO
YANAGI YASUHIRO
KAWAHARA YUZO
SENOO JUNJI
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