1. A content selecting method for allowing a target content to be selected as desired from a plurality of contents, the content selecting method comprising: transforming a three-dimensional image into a content selection image made up of a two-dimensional image viewed from a predetermined point of view, the three-dimensional image including content indicators each representing one of a plurality of contents, each of the content indicators being designated by a plurality of three-dimensional coordinates made of first, second, and third impression item values obtained by converting three items representative of impressions of each content into numerical terms; displaying the content selection image; and discriminating target content selected from the plurality of contents in accordance with the position of a selected target part on the content selection image and with the positions of the plurality of content indicators on the content selection image.