PURPOSE: To extremely reduce the load of a central arithmetic circuit by sending the identification information on a selected icon to the central arithmetic circuit when the icon is selected by a pointing device.

CONSTITUTION: A mouse 4 is operated and an icon A is pointed by a cursor. Under such conditions, the button of the mouse 4 is clicked and the event information is inputted to an interruption input part 7 from the mouse 4 in response to the button clicking operation. Then an interruption control circuit 8 reads the position information on the cursor obtained at input of the event information out of a coordinate position register 9. If this position information is included in an icon area, the circuit 8 reads the identification information on the icon having an area including the position information out of an icon information memory 16 and sends this information to a central arithmetic circuit 1 via a transmission buffer 11. The circuit 1 carries out the command and the application which are defined by the icon corresponding to the identification information.