An audio-feature analyzer automatically detects points of change in audio signals to be processed. A central processing unit (CPU) obtains point-of-change information indicating positions of the points of change in the audio signals, and the point-of-change information is recorded on a data storage device. The CPU identifies point-of-change information in accordance with an instruction input by a user via a key operation unit, and audio data corresponding to the point-of-change information identified is located so that processing such as playback of audio data to be processed can be started therefrom.