A touch screen including a display unit on which a plurality of icons are displayed, a touch detector operable to detect contact between a pointer and the display unit at a plurality of locations on the display unit, the plurality of locations forming a pattern that substantially surrounds more than one displayed icon, and a calculating unit to disambiguate an intended one of the plurality of icons, based on the pattern of locations that is detected by the touch detector, by determining which of the displayed icons are substantially completely surrounded, and by selecting an appropriate one of the substantially completely surrounded displayed icons.