An operation system has a controller (2) controlling a plurality of medical devices and a footswitch (3) transmitting an instruction signal to the controller, the footswitch (3) having a selection unit (3c) capable of selecting, from the medical devices, a medical device to be used and an output of the medical device； and a first and second pedals (3a, 3b) capable of instructing the selected medical device to perform the output, and the controller (2) having a memory unit (13) storing output pedal setting information comprising operator identification information identifying an operator； first pedal setting information comprising device identification information identifying the medical device corresponding to the first pedal and information about an output of the medical device corresponding to the first pedal； and second pedal setting information comprising device identification information identifying the medical device corresponding to the second pedal and information about an output of the medical device corresponding to the second pedal； and a control unit (11) controlling, when the selection unit selects given output pedal setting information and the respective pedals are held down, the respective medical devices on the basis of the first and second pedal setting information in the output pedal setting information.
