PURPOSE: A method for melody pitch candidate extraction of polyphonic audio based on a harmonic structure model is provided to extract melody pitch candidates in an audio signal including various sounds. CONSTITUTION: An audio signal including various sounds are short Fourier transformed(S10). The unit of the Fourier transformed audio signal is changed into a cent from Hz(S20). A peak point is extracted from each frame of the audio signal which was transformed to the cent unit(S30). The weight of a harmonic structure model which is included in candidate melody pitches is measured(S40). An energy level difference by a frequency is compensated based on the weight information(S50).
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