Information recording medium and its recording method and reproducing method and system controller the information recording apparatus and information reproducing apparatus

[Abstract] while ensuring continuous reproduction, and an object thereof is to provide a a can the information recording medium recording the real time data to the rewritable optical disk and its method apparatus. A reproducing apparatus is introduced standard reproduction model so that it can continuously reproduce real-time data data, to place the real-time extents on the information recording medium by using the real-time reproduction condition.