A data generation section generates an essence data file composed of a file header, a file body, and a file footer. A header size obtainment section obtains header size information of essence data file from the data generation section, and supplies the header size information to a clip generation section and an index file update section. The clip generation section generates a clip information file that describes the header size information supplied from the header size obtainment section. The index file update section registers a clip element that describes the header size information supplied from the header size obtainment section to an index file stored in a ROM.