PURPOSE: To improve operability when remote control is carried out with monitoring is effected on a monitor screen by a method wherein equipment and a site operation device are simultaneously photographed by a camera and displayed on a touch panel and a switch image according to which the equipment is operated is displayed in a state to be overlapped with the site operation device where a switch image is displayed.

CONSTITUTION: Equipment 5 and a site operation device 6 are photographed on the same screen by a camera 9 and displayed on a display device 15. A touch panel 16 is attached to the front of the display device 15. Switch images 17a-19b by means of which the equipment 5 is moved are overlapped with the image 6a of the site operation device 6, displayed on the display device 15, to display the images. The shape and the position of the switch image displayed in a state to be overlapped with the image 6 of the site operation device according to variation of the direction of a field are varied according to variation of the direction of a field a vision. The switch image is constantly displayed in the image 6a of the site operation device. This constitution causes accurate grasping of the moving direction and the direction of the equipment even when the direction of visual field of the camera is changed.