To improve the control accuracy and setting followup property of an actuator by making it difficult to receive the effect of a negative volume of the actuator and a piping system.

Detecting signal selection controllers 110 and 120 select the detecting signals of sensors 51, 52, 53, 61 and 62 provided in a plurality of actuators for each step. The combination of a subtractor 131 and adder 141 corrects a variable pump pressure command signal by a pressure detecting signal selected by the detecting signal selection controller 110, and outputs the corrected variable pump pressure command signal. The combination of a subtractor 132 and an adder 142 corrects a variable pump flow rate (speed) command signal by a speed, flow rate signal selected by the detecting signal selection controller 120, and outputs the corrected variable pump flow rate (speed) command signal.