PURPOSE: To operate actuators simultaneously and improve the performance of a guided missile by a method wherein one part of a rear wing is separated after the combustion of a rocket motor while a control signal from a controller is sent to the actuator of steering blades attached to the fore part and the aft part of a main wing.

CONSTITUTION: When a body has received the signal of completion of combustion of a rocket motor, the separating mechanism 9 of a rear wing 4 is operated and one part of the rear wing at the side of the trailing edge of the rear wing is separated from the body. Upon starting turning, the actuator 6a of a fore wing 2 is operated by the control signal of a controller 5 so as to elevate the leading edge of the fore wing 2 while the actuator 6b of the rear wing 4 is operated so as to descend the leading edge of the rear wing 4. In this case, the responsiveness of the body is improved by steering the fore wing 2.