An information recording apparatus is provided with a signal process device for generating and outputting content information including (i) identification information to identify each of partial record informations constructing whole record information to be recorded onto an information record medium and to indicate content of each of the partial record informations, and (ii) start position information indicating a start position on the information record medium of each of the partial record informations corresponding to the identification information, on the basis of control information inputted from the external to control a reproduction of the record information. The information recording apparatus is also provided with: a multiplex device for multiplexing the record information and the content information, to thereby generate and output multiplexed record information; and a record device for recording the multiplexed record information onto the information record medium.