The use of medication certification information can be expanded. Medication certification information is generated based on the information indicating medication status for each medication target recipient, and a token having management information for managing the medication certification information as an attribute value and including information indicating the usage history of the medication certification information in the attribute value is generated and stored. Each time the medication certification information is used, the information indicating the usage history of the token is updated, and upon receipt of a reference request for the usage history of the medication certification information from the terminal device, the information indicating the usage history included in the attribute value of the corresponding token is transmitted to the terminal device of the request source.