A contact position detecting unit 122 detects the position on the touch panel touched by a controlling object. A rendering unit 104 determines the layout of a document file including a link and display the document in the layout thus determined. A link position specifying unit 106 specifies the position of the link in the screen. A detection area setting unit 114 sets an object detection area for determination that the link is selected by the user as a result of contact with the controlling object associated one-to-one with the link, such that the object detection area occupies a range different from that of the link and is spaced apart from an adjacent object detection area by a predefined minimum distance, that the display mode of the link is maintained, and that the object detection area is superposed on the link. A matching unit 130 matches the position on the touch panel touched by the controlling object against the range occupied by the object detection area so as to determine which object detection area is selected.