PURPOSE:To easily check a current working position by arranging a display for the whole graphic and an expanded graphic display for expanding a detailed graphic in the whole graphic, and at the time of moving a cursor on the whole graphic display, moving also the expanding display interlocking with the movement and permitting reverse movement also. CONSTITUTION:A CAD is constituted of the whole graphic display 2 for displaying the whole graphic 1 and the expanding graphic display 5 for displaying a graphic obtained by expanding the detailed part 3 of the whole graphic 1. When the cursor 6 of the display 2 is moved, the cursor 7 of the display 5 is also moved interlocking with the cursor 6 to expand the size of the graphic. The reverse operation is also enabled to obtain an arrow 8 for displaying a current work position. The range displayed on the display on the display 5 is surrounded by a surrounding frame 9 so that the expanded graphic can be easily observed. In addition, a menu display part 10 is formed on the end part of the display 2 in order to easily execute the operation.
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