To eliminate inconveniences for a payer and a payee in a payment.

A part of payment instructions such as an account No. of a preceding instruction inputting person is inputted from a preceding instruction inputting person's system 100, and an additional payment instruction such as an account No. of an additional instruction inputting person is inputted from an additional instruction inputting person's system 200. A fund for payment is transferred from a payer's account 310 to a payee's account 320 by a bank's system 400 when all payment instructions required for transfer of fund are inputted.