REPRODUCTION DEVICE, REPRODUCTION METHOD, PROGRAM, AND COMPUTER-READABLE RECORDING MEDIUM

摘要

A reproduction device (400) includes a BD-ROM (200) containing a plurality of data units and an application program referencing the data units and reproduces the data units by executing the application program. The reproduction device (400) includes a reproduction processing unit (412) for controlling execution of the application program; a network IF unit (419) for acquiring an alternative data unit to replace a part of data units among the plurality of data units from an external server; and an HDD unit (418) containing correspondence information indicating the correspondence between the storage position in the internal recording medium containing the alternative data unit and the storage position of the data unit to be replaced, in the external storage medium. When the application program being executed reads out the data unit of the reference destination, the reproduction processing unit (412) judges whether the alternative data unit to replace the data unit exists in the internal recording medium according to the correspondence information. When the judgment is yes, the reproduction processing unit (412) specifies the storage position of the alternative data unit indicated in the correspondence information as a read out destination.