PURPOSE: To recognize logical upper/lower relation of an object before and after moving buoy or the like by providing a driving means moving one part of the body of equipment up and down when transmission position moves to area with logically different upper/lower relation on a display screen.

CONSTITUTION: When a mouse 1 is moved, the buoy enters inside the area of a graphic 33 on a screen 32. Event indicating the shift of the buoy from the lower area to the upper area is logically detected by an event detection module 31 to be notified through a cable 20 to a mouse 1 side. On the mouse 1 side, the event is interpreted by an inside event interpretation module 9. As the result, a control signal rising through signal lines 14, 15 to pressure rod driving devices 7,8 is transmitted, and the devices 7,8 move pressure rods 5,6 vertically upward by prescribed amount to float an upper lid 3 from the original position by prescribed amount. Therefore, an operator holding the mouse 1 can recognize the graphic 33 is logically higher than the graphic 34 by the rising of the upper lid 3. On the other hand, when the buoy moves from the graphic 33 to the graphic 34, the upper lid 3 is sunk from the original position by prescribed amount.