A music piece analyzer (1) includes: a reproduction time detector (2) configured to detect a reproduction time of an inputted sound data; an execution interval setting unit (6) configured to set an execution interval of Fast Fourier Transform (FFT) depending on the detected reproduction time by the reproduction time detector (2); and a sound data analyzing unit (5) configured to execute the FFT at the execution interval of the FFT set by the execution interval setting unit (6) to analyze the inputted sound data.
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