Disclosed is a control method in which control errors, attributable to a change of the state of a transmission mechanism, disposed between a servomotor and a load driven thereby, are reduced in controlling a driving force to be applied to the load.A detected value (PH) of the driving force applied actually to the load is compared with a set value (PL') of the force to be applied to the load. The driving current of the servomotor is controlled in accordance with the result of such comparison. Thereupon, a change of the correlation between the servomotor output and the driving force applied actually to the load, which is attributable to the change of the state of the transmission mechanism, is compensated automatically. Thus, the driving force applied actually to the load is adjusted accurately to the set value.