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Given melody notes are classified into particular notes and other notes than the particular notes in accordance with a predetermined criterion. Additional notes are decided with respect to the classified particular notes and the other notes in accordance with different criteria set for the classified particular notes and the other notes, to generate an auxiliary melody with the additional notes. For example, for each of the particular notes, an additional note is decided which has a predetermined musical interval from the particular note, so as to generate a plurality of additional notes with more emphasis on good sounding with the particular notes. For each of the other melody notes than the particular notes, an additional note is decided which has a musical interval determined on the basis of a flow of at least one of the main melody and the auxiliary melody, so as to generate additional notes with more emphasis on note-to-note connections of a generated auxiliary melody.