An aggregation system for aggregating contents recorded on a plurality of recording mediums and recording them onto another recording medium while protecting the copyrights of the contents is provided. An aggregation system (1) includes an aggregation apparatus (16) and a reproduction apparatus (17). The aggregation apparatus (16) obtains a main content from an optical disc (11), obtains a sub content from a memory card (12), and aggregates the obtained main content and sub content and records them onto a portable medium (13). The reproduction apparatus (17) obtains the main content from the optical disc (11), obtains reproduction control information for controlling reproduction of the main content, and reproduces the main content recorded on the optical disc (11) based on the reproduction control information.
