A whole stream consisting of a plurality of partial streams each composed of content information including still image information is multiplexed/recorded in packet basis on an information medium. The information record medium includes a file for storing object data consisting of a plurality of packets each containing a content information piece and a file for storing information defining an object data reproduction sequence. Furthermore, the medium includes an object information file for storing stream identification information for identifying each of the plurality of partial streams among the plurality of packets and address information indicating a recording position of an access unit.