This invention prevents ballooning of the amount of comment information while being applied to an operation environment of the user, and provides comment information associated with an intuitively plain operation in a way that is particularly easy for a user. To this end, upon launching of an application, a window including processing buttons and a message area is displayed. Immediately after display, bitmap data of that window is acquired (self-captured), and the acquired bitmap data is displayed in a reference image display area of the window after being scaled down. Arrow lines which specify correspondence between comments in a message area and the buttons in the reference image display area are displayed.