PURPOSE: To execute the processing at a high speed, by operating the necessary terminals at the same time and also by controlling the respective terminals mutually, in accordance with a command of the control circuit.

CONSTITUTION: The respective terminals 51∼5n are connected to the connecting device 4 in series or in parallel in the optional sequence through the bus by the connection command according to the use, by the control circuit 6, and the control signals which are sent onto the bus from the respective terminals 51∼5n are made to execute AND or OR on the bus by the wired theory, so that plural terminals can be operated at the same time, mutualy controlling the respective terminals of the same or different speed. Accordingly, the terminals to be operated can be operated by only sending out the start instruction from the control circuit 6.