Customers are enabled to obtain information printed on a receipt without greatly changing the configuration of devices such as POS registers that process product sales.A information management system 1 has a printer 3 that prints a receipt based on transaction information related to a product sale; a receipt database 7 that stores transaction information relationally to a unique ID 52; an member service server 6 that registers unique IDs 52 in the receipt database 7; an NFC reader 45 that reads the unique IDs 52; and a control unit 30 that determines if a unique ID 52 is registered in the receipt database 7, prints transaction information and access information for accessing the member registration server 62 if the unique ID 52 is not registered, and sends the unique ID 52 and the transaction information to the member service server 6 if the unique ID 52 is registered.