| 摘要 |
PROBLEM TO BE SOLVED: To effectively use points given by one point system for another point system, while making good use of the existent point systems. SOLUTION: A member 10 registered to the point systems 20A and 20B specifies a transfer source, a transfer destination, and transferred points and requests a point transfer system 30 to transfer them (1). The point transfer system 30, having received the transfer request, sells points Pi by an amount Mi to the point system 20A as the transfer source (2), makes points Pa that the member 10 has in point system 20A decreased by points Pi (2'), buys points Pj from the point system 20B as the transfer destination by the amount Mj obtained by subtracting transfer profit (m) from the amount Mi (3), and makes the points Pb of the member 10 in the point system 20B increased by points Pj (3'). |
