An additional information read/write system has an ID/additional information distributing apparatus, an ID postscribing apparatus, and a drive system. The ID/additional information distributing apparatus includes a managing unit for managing IDs postscribed to optical discs and additional information for updating content read from each of the optical discs and a distributing unit for distributing the IDs and the additional information corresponding to the IDs. The ID postscribing apparatus includes a transmitting and receiving unit and a writing unit. The drive system includes a transmitting and receiving unit for transmitting the IDs to the ID/additional information distributing apparatus and receiving the additional information, a writing unit for writing the additional information on a storage medium, and a playback unit for playing back the content updated based on the additional information from the storage medium.