To effect appropriate value setting of the opening of a variable stator blade even during acceleration, by obtaining a corrected variable stator blade in accordance with the angle of inclination of the variable stator blade with respect to the acceleration rate and correction speed of an engine during acceleration, and calculating this corrected variable stator blade angle.

A corrected speed NGC 25 with respect to actual measured air temperature is obtained from the air temperature TT 25 at the compressor inlet and gas generator speed NG. Next, the setting angle VSV-SS of the variable stator blade to which it should be set is obtained. Also, the acceleration rate δ NGC 25 of the engine is obtained by the control timing of a control device 10. The change width (inclination) δ VSV-SS/δ NGC 25 of the setting angle of the variable stator blade with respect to the corrected speed NGC 25 is obtained. The inclination δ VSV-SS/δNGC 25 of the variable stator blade based on the corrected speed NGC 25 is obtained from this relationship. In this way, the corrected amount of VSV-TR of the variable stator blade obtained with respect to the corrected speed NGC 25 is output as the set angle VSV-REF of the variable stator blade during acceleration.