PURPOSE: A method for extracting an imaginary ordering account is provided to extract imaginary ordering account and increase credibility by extracting by performing 2-step extracting test of imaginary ordering account. CONSTITUTION: A total ordering of each account for a day is calculated using transaction information transmitted at real time. When the ordering specification of the account is in the high setting level, the account is divided at a suspicion account. If the value of transaction success is under the first setting value, or the changing rate is over the second setting value, the suspicion account is divided at an imaginary account. The account combination is generated of the first imaginary account. By comparing the extracted imaginary account transaction day by day, the extracted imaginary account exists more than one time, the extracted imaginary account gets an imaginary account finally.
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