With a rapid popularization of the global-area network, realizing an information retreaval method for media data is essentially important today. As forcusing to the information retriaval methods for music data, absolute methods to automatically extract impressions, which becomes metadata, of music data do not exist. In this paper, we propose an automatic metadata creation method for music with multiple musical instruments. The impression for each musical instrument is extracted from the music data which consist of multiple instruments and weighted according to each importance of the musical instrument. Our method extract the impression of a music datum by compounding the impression of each musical instrument with others. We clarity the effectiveness of the method in a view point of compounding the impression of each musical instrument by comparing to present methods, and the effectiveness of weighting by showing the result of the actual questionnaire.
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