The present invention includes: a display/optical sensor section (300) that displays an image and captures an object image located in the vicinity of the display/optical sensor section (300); a browser processing section (11) that causes a window including a placement area to be displayed on the display/optical sensor section (300), the placement area being an area for placing an object; an API processing section (12) that converts first area information into second area information, the first area information indicating the location of the placement area in the window, the second area information indicating the location of the placement area in the display/optical sensor section (300); and a driver processing section (15) that derives a captured image, the captured image being an image of the object located in the vicinity of the display/optical sensor section (300) and captured through an area defined by the second area information.