A configuration is provided that allows secure data management to be performed on subsequently acquired data associated with content management units. When subsequently acquired data, such as information subsequently generated or downloaded by a user in association with content stored on an information recording medium, is recorded to a hard disk or the like, subsequently-acquired-data search information and access control information are set. This configuration allows a subsequently-acquired-data file to be searched for and be obtained based on the subsequently-acquired-data search information and allows access control for each subsequently-acquired-data file to be performed based on the access control information. The search information and the access control information are also set in shared directories, such as a studio shared directory.