A recording/reproducing device (115) includes a storage unit (117) containing a content attribute database (DB1) and a point database (DB2). A point calculation unit (120) of the recording/reproducing device (115) extracts attribute information for each content from the content attribute database (DB1) and extracts an erase factor point correlated to an erase factor corresponding to the extractedattribute information for each content from the point database (DB2). According to a plurality of extracted erase factor points, an evaluation point is calculated. Thus, a user can appropriately assure an empty capacity required for a recording medium.