1. A client terminal, comprising: one or more circuits configured to: control a plurality of candidates for reference captured images to be displayed on a display unit, wherein each of the reference captured images is retrieved based on a preliminary captured image obtained by preliminary image capture in an imaging unit and is referred to during actual image capture; control detailed information to be output, wherein the detailed information is attached to a reference captured image selected from among the displayed plurality of candidates for the reference captured images; and control each of the plurality of candidates for the reference captured images to be overlaid on a map image displayed on the display unit.