Used article quotation method and system

A Web server receives a maximum cash-out quote PAmax of a used article from a database server and calculates a minimum cash-out quote PAmin, a maximum trade-in quote PBmax, and a minimum trade-in quote PBmin of the used article from the maximum cash-out quote PAmax (step S 210 ). The maximum cash-out quote PAmax is compared with a preset threshold value P1 (step S 220 ). When the maximum cash-out quote PAmax exceeds the preset threshold value P1, it is determined that the used article is worth of both a cash-out without purchase of any new product and a trade-in with purchase of anew product. The Web server accordingly creates a quotation window including the maximum cash-out quote PAmax, the minimum cash-out quote PAmin, the maximum trade-in quote PBmax, and the minimum trade-in quote PBmin of the used article (step S 230 ) and sends the quotation window thus created to a user computer.