PROBLEM TO BE SOLVED: To generate a suitable harmony singing voice by pitch-shifting a singing voice input from a microphone in a harmony section of Karaoke music including a plurality of singing parts.SOLUTION: A Karaoke system includes: pitch-shift execution means 14 for executing pitch shifting for each of singing voice signals output from a plurality of microphones 13 associated with respective singing parts; singing scoring means 27 for calculating singing score values of the singing voice signals output from the microphones 13; singing score value comparison means 28 for comparing the singing score values of the respective microphones 13; and pitch-shift control means 29 for executing, when a difference between a highest singing score value and a lowest singing score value is equal to or higher than a predetermined threshold value, pitch-shifting so that the difference between the singing score values can be lower than the predetermined threshold value in a harmony section detected by harmony section detection means 33.SELECTED DRAWING: Figure 1
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