A host apparatus included in a reproduction apparatus for reproducing second information from a write-once recording medium having first information and the second information recorded thereon, correlation information for correlating the first information and the second information being further recorded on the write-once recording medium, the reproduction apparatus further including a drive apparatus for reproducing the second information from the write-once recording medium based on the correlation information, the host apparatus comprising:
- an instruction section for instructing the drive apparatus to reproduce the second information from the write-once recording medium.