PURPOSE: A product bidding system for limiting a product price within step increase and a method thereof are provided to supply a reasonable product bidding service that secures a reasonable price, by increasing the highest bidding price step by step. CONSTITUTION: An initial value registration unit(211) stores an initial value of an increase ratio that induces the step-by-step increase in price as well as the ranking of individual product and the lowest bid price. An initial value automatic setting unit(212) automatically sets up the initial value of expected price, a highest bid price and the price for each ranking. When there is the highest bid price, a highest bid price increase unit(234) sets up a bid product and increases the bid price at the increase ratio for every product. When the expected price is changed, an expected price determination unit(233) compares the each expected price with the price for each ranking. Therefore, the lower price is determined as the expected price.
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