A management system manages, for each of a plurality of users who use a social network service, account information, identification information associated with biological information, and a public key; sends, in accordance with an instruction related to money transfer to another user, a demand of authentication processing to the terminal of the user; receives, as a response to the demand, the identification information associated with the biological information and signature data created using a private key held in a storage unit having a tamper resistance in the terminal when the authentication processing using the biological information of the user succeeds; verifies, using the public key corresponding to the received identification information, the received signature data; and generates, based on a result of the verification, a message about the instruction.