An information processing apparatus having: a data processor for executing processing for storing acquired data, which is generated or obtained, on storing means as data associated with content read from an information recording medium, wherein the data processor is arranged to execute processing for setting, in a data directory set for the storing means, one or plural file-system directories, each directory corresponding to a different piece of identification information set for the information recording medium or the content and for setting, in each of the set file-system directories, a file of the acquired data and search information for the acquired-data file, wherein the data processor is arranged to execute processing for setting, in the data directory set for the storing means, a shared directory that can be shared for multiple different pieces of identification information set for the information recording medium or the content, and for setting, in the set shared directory, another acquired-data file and search information for the another acquired-data file, wherein the data processor is arranged to execute processing for setting, in the search information of the acquired-data files in the file-system directories and the shared directory, respectively, a file-name conversion table for converting a first file name of each of the acquired-data files into a second file name suitable for a content-playback processing, wherein the data processor is arranged to execute processing for setting, as a file associated with the data directory, access control information regarding the acquired data, wherein the access control information has access request information containing access authority information, which indicates a file-system directory or a file set in the file-system directories, or the shared directory as being a candidate for virtual combination with the content, and access enable/disable information in which a use validity period and write- and read-enable/disable-information for the file set in the file-system directories or the shared directory is recorded. a data processor for executing processing for storing acquired data, which is generated or obtained, on storing means as data associated with content read from an information recording medium, wherein the data processor is arranged to execute processing for setting, in a data directory set for the storing means, one or plural file-system directories, each directory corresponding to a different piece of identification information set for the information recording medium or the content and for setting, in each of the set file-system directories, a file of the acquired data and search information for the acquired-data file, wherein the data processor is arranged to execute processing for setting, in the data directory set for the storing means, a shared directory that can be shared for multiple different pieces of identification information set for the information recording medium or the content, and for setting, in the set shared directory, another acquired-data file and search information for the another acquired-data file, wherein the data processor is arranged to execute processing for setting, in the search information of the acquired-data files in the file-system directories and the shared directory, respectively, a file-name conversion table for converting a first file name of each of the acquired-data files into a second file name suitable for a content-playback processing, wherein the data processor is arranged to execute processing for setting, as a file associated with the data directory, access control information regarding the acquired data, access request information containing access authority information, which indicates a file-system directory or a file set in the file-system directories, or the shared directory as being a candidate for virtual combination with the content, and access enable/disable information in which a use validity period and write- and read-enable/disable-information for the file set in the file-system directories or the shared directory is recorded.