A non-linear function f(A) of an effective value D' with respect to a desired value A regarding speed, pressure or the like of an actuator of a hydraulic apparatus in a closed loop control for the hydraulic apparatus is operated and a value regarding quantity of electricity to be applied to a valve of a drive mechanism of the hydraulic apparatus is outputted as a non-linear function f(A) in a case where a non-linear function D=f(A) is established between the desired value A and an effective value D regarding speed, pressure or the like of the actuator in the opened loop control for the hydraulic apparatus.