To achieve labor-saving of processing by repeating data of music parts when, synchronously with music performance, dividing music into music parts by external input to generate display time data of the music parts, to achieve smooth relay to external input processing after repeating processing when repeating the data of music parts, and to collectively set selections of synchronous parts by setting parts of display pause intervals with a fixed frequency.

When delimiters of music parts are inputted synchronously with music performance and part numbers are added to the music parts and performance times of the music parts are measured to generate display time data, a range is designated with respect to similar music parts and a repeat function is applied to achieve labor-saving in part setting and generation of synchronous display data. Furthermore, an interval frequency is set, and musical parts to be entirely displayed continuously and parts of intervals are set as one set in accordance with the frequency, and selected part data is generated with a fixed frequency by repeating.