In the present invention, a user allows a computer to execute application software to display an object on a display and to move the object by dragging and dropping it using a pointing device, thus providing instructions of insertion or replacement of the displayed object. When the user drags and drops an object on a screen displayed on the display in accordance with the application software, an area corresponding to a position where the object is dragged or dropped is emphasized. Accordingly, the user can easily see a position where the object is dragged and dropped. When the type of process to be performed on the object varies in accordance with the position where the object is dropped, the area is emphasized with an emphasis pattern corresponding to a process to be executed. Accordingly, the user can easily determine a position where the object is dragged or dropped.