| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for improving security performance in electronic commercial transaction by authenticating whether or not the purchaser of merchandise or the like and the owner of a credit card or the like are the same person in Internet shopping. SOLUTION: In this communication line shopping system equipped with a server device which provides merchandise or a duty through a communication line and a client device which purchases the merchandise or duty provided through the communication line by the server device, the server device is provided with an obtaining means for obtaining the telephone number of the client through the client device and the communication line and an announcing means for announcing a keyword to the client by dialing the obtained telephone number. Thus, when the announced keyword is returned from the client, the merchandise or duty is provided to the client. |
