PURPOSE: To produce a visually equivalent effect by a method wherein an image from the visual point position of a finger camera assumed that the camera is mounted on the finger side of a working arm so as to photograph fingers is produced by a graphic simulator and graphically displayed.

CONSTITUTION: A camera is attached to the finger part of a working arm 7, the image of fingers is photographed and inputted to a finger camera simulation image producing means 10 through communicating devices 3 and 4. The image producing means 10 produces a simulation image, as seen from the visual point position of the finger camera, by means of predetected structural information of the working arm 7 and various information of an environment model, serving as a data base, based on a remote control command value from a master operation device 1, and hourly displays the simulation image on a display device 11.