Performance evaluation method for use in karaoke apparatus

A method for measuring by a difference between the vocal sound karaoke musical accompaniment OK singer with a sound image generated by the device and method of evaluation Evaluation sing sung by the karaoke singer's OK OK in the karaoke apparatus. By simultaneously sampling singing voice Kara OK singer with musical accompaniment, respectively. Generating digitized audio signal and their corresponding digital accompaniment signal. Then, the difference and the difference between the trend of a digitized audio signal corresponding digital accompaniment signal, and for generating a singing score.