An audio information provision system for providing a target with an audio information stream suitable to the target includes a database for storing a plurality of audio information streams; an inherent condition input section for receiving an inherent condition of the target; a variable condition input section for receiving a variable condition varying in accordance with time; a selection section for selecting at least one audio information stream from the plurality of audio information streams based on at least the inherent condition and the variable condition; and an output section for outputting the at least one audio information stream.