1. A content-preference-score determining method comprising: during a playback of each of a plurality of pieces of content, each of the plurality of pieces of content comprising a plurality of segments: detecting a feature point or feature value of one or more segments of the piece of content; detecting a magnitude of a body motion of a user; and calculating a preference score of the user for each of the one or more segments of content according to a predefined formula using the detected feature point or feature value of each segment and the detected magnitude of the body motion; and after the playback of the plurality of pieces of content: controlling a subsequent playback of the content so that the one or more segments are played back in an order which is based at least in part on the preference score calculated for each of the one or more segments.