Impression words express impressions about music pieces and are separated into groups called impression axes. Impression words in each of the impression axes have meanings mutually related with each other. There is a correspondence among the impression words, the impression axes, and the music pieces. One is designated among the impression axes. One is designated among the impression words. A music piece corresponding to the designated impression axis and the designated impression word is played back. Commands are generated which constitute questionnaire choice information about the played-back music piece. A user is enabled to choose one from the generated commands. An impression axis and an impression word corresponding to the command chosen by the user are obtained. A music piece corresponding to the obtained impression axis and the obtained impression word is played back.