As a method of purchasing a financial product, if it is determined that the balance of the investor''s securities account is smaller than the value of the investment product when the investor is requested to purchase the investment product, at the securities company server, an additional difference required for the purchase of the investment product Request the account transfer for the above amount to another financial institution server and receive the transfer result message from the other financial institution server indicating that the transfer of the difference was successful. The value of the payment request amount field is updated by adding the value corresponding to the difference to the value of the payment request amount field for the sum, and the sum of the balance of the securities account and the amount corresponding to the value of the payment request amount field is the investment If the value of the product is greater than or equal to the product, the process for purchasing the investment product .
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