A surgical system according to the present invention comprises: a surgical instrument (7, 8, 10) for medical treatment of an affected portion in the body cavity an observation device (9) for observing tissue in the body cavity an image display device (12, 13) for displaying images taken by the observation device and an indicating-point control device included in at least one of the surgical instrument and the observation device, for controlling the position of an indicating point (27) superimposed on an image displayed on the image display device.
