To save a calculating circuit in a plurality of operation when an operating procedure includes a plurality of parallel operation, by overcoming such a problem that parallel operation circuits are prepared as many as the number of operation procedures, resulting in that the circuits are enlarged in proportion to the operation procedures.

The all-purpose parallel operating circuit is constituted of a parallel operating-procedure memorizing circuit memorizing an operating procedure, a parallel operating input switching circuit switching input of an operating apparatus, a parallel operating circuit conducting parallel operation, and a parallel operated value feedback circuit returning operated results to the input of the parallel operating circuit.