The possibility of information acquired from a recording device not being correct can be detected. A management server 20 has an information reader 63 that reads related information stored in nonvolatile memory 74 of an ink cartridge 13, an information acquisition unit 62 that acquires related information by communication from a coupon printer CP, and a information comparison unit 64 that compares the related information read by the information reader 63 with the related information acquired by the information acquisition unit 62.