1. A music editing apparatus, comprising, a remix processing section which performs a remix process based on both meta data that are pre-generated corresponding to song data and that contain at least a time-based beat position and a file for deciding a remix pattern; a synchronizing reproduction controlling section which generates a master beat, sends the master beat to the remix processing section, and reproduces a plurality of songs based on individual entries of the meta data according to the remix process that the remix processing section has designated corresponding to the remix pattern and the meta data; and a mixing section which mixes songs reproduced by the synchronizing reproduction controlling section, the remix processing section being characterized in that the remix processing section performs the remix process based on a remix pattern file structured as hierarchical layers each of which has a control parameter portion and a data entity portion.