To ensure the control of a vehicle, the confirmation of a control condition and the communication of the vehicle side information, by comprising an on-vechile controller and a vehicle side communication device connected with the controller.

A transmission signal from a vehicle side transceiver 41 is received by a portable telephone side transceiver. Whether a received signal comprises the image data and a voice signal or not is judged on the basis of the existence of the corresponding specific frequency, and further whether it is the voice signal or the image data is judged by an ID code, image data, character data, or voice signal extracting circuit. The display onto an image display part in a cabin, the telephone processing or the like are performed on the basis of the result of the judgement. Further a vehicle side control circuit 47 periodically judges whether a function code and the voice signal are received or not. Accordingly when the transmission signal, that is, the function code and the voice signal are received from the portable telephone device, whether it is a switch signal by a function switch or the voice signal is judged. Then the transmission of the image in the cabin, the telephone processing or the like are performed.