A musical performance information compression apparatus or the like of the present invention has a primary code production unit which separates SMF or the like into information of a relative time between events, information of a sounding start pitch, information of loudness, information of a sounding end pitch, and other information for each channel and which integrates each information regardless of the channel and which disposes the integrated information in independent regions to produce a primary code, and a secondary code production unit which compresses the information of each region of the primary code produced by this primary code production unit by an LZ coding method, a Huffman coding method and the like.