An apparatus for simulation of an endoscopy operation. A dummy endoscope (1) is inserted into a unit (2) which monitors the position of the dummy instrument and provides force feedback to the instrument in accordance with a stored software model. A virtual image simulating the view from the endoscope is displayed. Additional simulation is provided of an external condition to the patient body, for example patient orientation (8), external pressure applied to the body (9), (10) and trans-illumination (11).