[Problem] When using a prepaid card for online stock purchase, it is not necessary to input a card ID, and payment can be smoothly made with the prepaid card. A trading server 80 of a securities company system 2 that manages user accounts for stock transactions receives login information from a user terminal T1 and performs login processing, and the prepaid money of the prepaid card of the user who has completed login. The amount of money is inquired to the advance payment management server 5 of the business entity that issued the prepaid card. The advance payment management server 5 transmits, to the transaction server 80, advance payment information notifying the advance payment in response to the inquiry. When receiving the prepayment information, the transaction server 80 determines whether or not the purchase order for the user can be purchased based on the notified prepayment and the deposit amount of the user account, and determines that the purchase is possible using the prepaid card Causes the user terminal to display a screen confirming that the purchase is to be made using the prepaid card. [Selected figure] Figure 1
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