Singing voice edit assistant method and singing voice edit assistant device

A singing voice edit assistance device comprising:

• a memory configured to store instructions, and
• a processor configured to execute the instructions,
• wherein the instructions cause the processor to perform the steps of:
• judging whether phoneme data, based on which waveform data for listening contained in a data set for singing synthesis is synthesized, is available or not for a user to edit a singing voice, wherein the data set for singing synthesis contains score data representing a time series of notes, a lyrics data representing words corresponding to the respective notes;
• and
• synthesizing the waveform data for listening while shifting pitches of phoneme data, representing waveforms of phonemes, indicated by the lyrics data to pitches indicated by the score data and connecting the pitch-shifted phoneme data and, wherein, if the indicated phoneme data is not available, the synthesizing synthesizes waveform data for listening based on the score data, the lyrics data, and substitute phoneme data available for the user instead of the indicated phoneme data.