A highly integrated data structure for synthesizing a waveform is provided for facilitating integrated handling of the data. The data structure for waveform synthesis data or use in generation of a target waveform comprises, at a macro level, a macro waveform value data field for storing a waveform value data section including source waveform value data for use in the generation of the target waveform, and a macro (first) header including control data for forming a macro waveform in the target waveform using the source waveform value data included in the data field. At a micro level, the data structure according to the present invention comprises a micro waveform value data field, and a micro (second) header for generating a micro waveform in the target waveform using the waveform value data included in the micro waveform value data field.