When an image of content reproduced by a first reproduction device is shot, a content display support device obtains the shot image and positional information that specifies the position and orientation of a shooting device. The content display support device generates combination content by visualizing and embedding the positional information in the shot image and transmits the combination content to a second reproduction device. A portable terminal obtains the positional information from an image obtained by shooting the combination content reproduced by the second reproduction device. The portable terminal requests supplementary information by transmitting the positional information to the content display support device. The supplementary information associated with the positional information is transmitted from the content display support device to the portable terminal and displayed at the portable terminal.