PURPOSE: To easily use a stroke command even by a person who does not memorize the selecting method of the stroke command.

CONSTITUTION: A guide information reading means 1 reads the guide information of the stroke command from a guide information storing means 7 and when a guide mode is set in the case of depressing the button of a mouse, a first stroke guide information display means 3 displays the guide information of the first stroke. When the mouse is moved for one stroke, a locus judging means 4 judges the locus of moving the mouse and when the guide mode is maintained while continuously pushing the button of the mouse after the mouse is moved for one stroke, a next stroke guide information display means 5 displays the guide information of the next stroke. When the depression of the button of the mouse is canceled after the mouse is moved for one stroke, a command selecting means 6 selects the command based on the mouse locus judged by the locus judging means 4.