| 摘要 |
An object of the present invention is to prevent a fraudulent use of a credit card such as spoofing. A server receives a card ID of a credit card, a credit amount, and a terminal ID for identifying a shop terminal from a shop terminal (S 102), to start credit processing. The server acquires a corresponding user ID from the card ID (S104), to find out whether this user has approved that location information can be acquired from his/her mobile terminal (S106). In the case where the user has approved that location information is acquired in advance (OK at S106), the server acquires a mobile phone number from the user ID (S108), to know a location of the mobile terminal with use of this mobile phone number (S110). Area information of a base station in which the mobile phone resides is provided in the case where the mobile terminal is not equipped with a GPS function. The server acquires a shop ID from the terminal ID (fixed-line telephone number) of the shop terminal (S112), to be able to acquire a shop location from the shop ID (S 114). The server compares the location of the mobile terminal and the location of the shop, to judge whether or not conformance is made with a predetermined condition (S116). In the case where it is judged that conformance is made with the condition (OK at S116), the server makes a normal credit judgment (S118), thereby sending a reply (availability/unavailability information) to the credit inquiry (S120 or S122). |
