One inventive aspect relates to a method which easily distinguishes copycat products that are difficult to distinguish by identifying only a media ID. A media ID and other attribute data are read out of a reference optical recording medium, and then a media ID and other attribute data are read out of an optical recording medium that is a target for separation. They are compared with each other in a data record processing section to determine whether data is data matched or not matched, and the result is displayed on a display section.