Endoscope position/attitude information acquisition means (44) which acquires position/attitude information of an endoscope (11) is connected to a control device (39) which controls a motor box (28) which actively actuates a surgical instrument, and the control device (39) utilizes the position/attitude information to adjust a control signal of the motor box (28) so that a position deviation of the surgical instrument within an endoscope image when the position of the endoscope changes is prevented from occurring.
