To provide a method and a system for managing a processing history with which processing history data can be easily checked and no inconsistency in data occurs.

Processing history data is printed on a protective cover by an ink jet printer 53 during a cutting and collection process. During a bagging process, the processing history data of the cover is read by a bar code reader 104, and processing history data with the same contents is printed on a packaging bag by an ink jet printer 106. If instruct-to-pick-out data is added to the history data, a corresponding recording film is discharged by a discharger 107. During a casing process, the processing history data of the packaging bag is read by a bar code reader 130, and processing history data with the same contents is printed on a packaging box by an ink jet printer 132. During a process of casing in a corrugated fiberboard box, the processing history data of the packaging box is read by a bar code reader 143, and history processing data with the same contents is printed on the packaging box by an ink jet printer 145.