The object of the invention is to automatically adjust the angle of an end effector to improve on the operability of medical treatment tools.The medical system of the invention comprises a slave medical treatment tool to be controlled and including a moving joint for adjusting the angle of a first end effector relative to a first shaft a master medical instrument serving as a master control instrument and including a second end effector located at a distal end of a second shaft a sensor that produces a sensor signal including at least an angle of the second end effector and a controller that enables follow-up processing for driving a driver such that the angle of the first end effector follows a follow-up criterion set on the basis of a sensor signal produced out of the sensor.
