According to the present invention, provided is a method comprising the steps of: (a) acquiring first-direction and second-direction transaction information by performing or repeating a process, which generates the first-direction transaction information indicating that monetary exchange transactions have been completed according to a first exchange rate, and a process, which generates the second-direction transaction information indicating that monetary exchange or transfer transactions have been completed according to a second exchange rate, when information, corresponding to the amount of money, of a first country currency, which is to be exchanged into a second country currency or transferred to a second country according to the second exchange rate, is detected; and (b) allowing a first recipient corresponding to the first-direction transaction information to receive, as the amount of money to be received, the first country currency acquired by the second-direction transactions and allowing a second reci
