PROBLEM TO BE SOLVED: To provide a saving financial product using a limit order to disperse a buying price and to reduce fluctuation risk at an installment saving in a financial product with price fluctuation.;SOLUTION: A purchase is made by: establishing conditions of upper-limit of range (1), lower-limit of range (2), pitch width (3), transaction currency (100 currency unit) (4), benefit-acquisition presence (5), benefit-acquisition amount (6), all settlement rate specification presence (7), and total settlement rate (8); creating a limit arrangement; and automatically placing an OCO order across a present rate in sequence from a point close to the present rate.;COPYRIGHT: (C)2015,JPO&INPIT
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