A DBMS performs a checkpoint process for maintaining consistency of data. A receipt printer 10 has an RFID tag 27 that can contactlessly read and write information by means of wireless communication with an external data processing terminal is disposed in the case, and the data processing terminal can read and write product warranty related data to the RFID tag 27. The turf designates a geographic area within a telecommunications network. At this time, by adding correction of the regional color difference data based on the characteristics of each region and the contents of the image, and correction of the IW supplies based on external factors and variables, even unskilled operators can perform rapid IW supply control based on the contents of the image.