To reproduce multimedia information without the use of control information.

A multimedia information reproducing apparatus controls reading of the multimedia information according to navigators, which analyze the control information used for reproducing a DVD-ROM. In a reproduction mode switching method of the multimedia information reproducer, the reproducer controls reading of the multimedia information in a first reproduction mode, according to a 1st navigator that analyzes the control information recorded on the DVD-ROM, controls reading of the multimedia information in a second reproduction mode according to a 2nd navigator, that is set based on the data received from an external server and also properly switches the first and second reproduction modes.