Performing check processing operations from MICR processing to scanning the printed check as a continuous sequence of operations lightens the burden on the operator and shortens the required processing time. The compound processing system 10 has a transportation path 15 for conveying a check P, an MICR head 17 positioned along the transportation path 15 for reading MICR text prerecorded on the check P, front print head 23 positioned along the transportation path 15 for printing on the front of check P, back print head 21 positioned along the transportation path 15 for printing on the back of check P, and a scanner head 25 positioned along the transportation path 15 for scanning the printed side (either back or front) of the check P.