PURPOSE: To shorten remarkably a data transfer time and a processing time by inputting a data from plural serial data transfer lines, executing its operation by bringing it to a serial-parallel conversion, and outputting it to plural serial data transfer lines.

CONSTITUTION: Input data IN1WIN6 are inputted simultaneously by a serial transfer to six serial-parallel converting circuits 11-1W11-6, respectively, from plural serial data transfer lines 101W106. The serial-parallel converting circuits 11-1W11-6 convert said sata to parallel data, respectively, and input them to an arithmetic circuit 13. The parallel data inputted to the arithmetic circuit 13 executes a prescribed operation, receiving a control by an arithmetic control signal from a controlling circuit 16. The parallel data of a result of operation outputted from the arithmetic circuit 13 is converted to a serial data and outputted through output lines 141W144.