6 and the communication ic 6 outputs the control communication data possessed by this control message signal to the output buffer 9 the output buffer 9 forms the output signal according to this control communication data and outputs the output signal to the actuator and the like connected with the peripheral station to operate for example in the case of the fr door node ecu 14 the door lock turn off the central station and the peripheral station work as described above wherein the data bit position in the information message signal and a position of an input output port the input buffer 8 and the output buffer 9 of the peripheral station correspond in a one to one manner thus the information communication data formed in the input buffer 8 can be exactly carried on the communication line 5 as the information message signal in addition in the present example according to the judgment processing in the cpu 1 the peripheral station to which the control communication data should be sent is judged and the control communication data is formed by converting into the output form suitable for the applicable peripheral station the rearrangement of the data and the like thus it is unnecessary for the peripheral station to perform judgment signal conversion and the like.