PURPOSE: To simplify operations by moving the position of a viewpoint with a triaxial operation in the case of displaying a three-dimensional graphic.

CONSTITUTION: A viewpoint moving amount setting means A100 and a viewpoint moving amount setting means B101 are used for moving the position of the viewpoint in the case of displaying the three-dimensional graphic. The coordinate of the moved viewpoint is stored in a viewpoint storing means 111. The coordinate of a reference point is numerically inputted by a user while using a keyboard 115 or inputted by resetting a point, which is indicated by a cursor at present, to a new reference point. Further, since a switch 103 is pushed after the cursor is moved to a desired position to be indicated, an ON/OFF detecting means 104 detects the ON state of the switch 103 and when it is reported to a computer 118, the computer 118 calculates the coordinate of the position indicated by the cursor and stores the coordinate in a cursor storing means 112.