An information management system which enables analysis on basis of a processing history of content with use of a portable displaying-and-recording medium, includes a log recording function of managing user identification data to specify a user who owns the portable displaying-and-recording medium and content identification data to specify content, and recording the user identification data and the content identification data in an associated manner after the user performs processing of the content. Preferably, the portable displaying-and-recording medium records/retains data in a state where content is displayed and is capable of rewriting the content.