PROBLEM TO BE SOLVED: To correct a deviation in tempo and a deviation in pitch while keeping the strength of a sound as it is.;SOLUTION: A computer is made to function as a musical score input means, a musical score data storage means, a note data generating means, an actual sound input means, a sampling data generating means, a reference performance file generating means, an actual performance input means, an actual performance storage means, a waveform differentiating means, a soundless part inserting means, an actual performance sound data storage means, an actual performance maximum amplitude frequency storage means, an actual performance sound length storage means, an actual performance correcting means, and a performance reproducing means of reproducing a performance having been corrected. Here, the actual performance correcting means stores sound data of the actual performance file when the sound data in the actual performance file which corresponds to note data satisfy note length of 0 to 300 milliseconds and maximum amplitude frequency of -2 to +2%, or sound data in a sample data file when not in a performance correction file together with a starting time.;COPYRIGHT: (C)2004,JPO
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