| 摘要 |
In response to reception of a login request for the trade-in service, a Web server sends a login window to the client computer of a customer via the Internet (step S300). The login window has a trade-in ID input box, a mail address input box, and a 'Login' button. After entering a trade-in ID and a mail address into the boxes, the customer clicks the login button. The Web server receives the entries of the trade-in ID and the mail address and determines successful or failed authentication (step S304). In the case of successful authentication, the Web server determines whether preset days have elapsed since the date of purchase order to determine whether the current time is within an allowable trade-in period (step S306). In the case of the current time is within the trade-in period and prior to trade-in reception, the Web server executes a trade-in reception routine (step S314).
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