1. A control method for controlling a computing device, comprising: displaying a plurality of character key images in a first display area on the computing device, each character key image representing and being associated with at least one of the character groups, each character group including a plurality of characters; and displaying, in a case where one of the character key images is selected by a user of the computing device, a plurality of input candidate characters in a second display area on the computing device, the plurality of input candidate characters including at least some of the plurality of characters in the character group associated with the selected one of the character key images, the second display area being set in a partially overlapping manner over the first display area.