PURPOSE: To easily process the generation, conversion, etc., of a picture by means of a pointing device.

CONSTITUTION: A mouse such as the two mice and 5, for example, are connected with one picture processor as the pointing device. The two mice are independently provided with respective control processes and can be treated as absolutely different input devices. Coordinate data inputted from the two mice are interpreted as respective meanings in accordance with meaning data stored in a memory 6. The generation, conversion, etc., of the graphic is processed in accordance with the obtained meaning.