PROBLEM TO BE SOLVED: To allow the purchaser of merchandise constituted of agricultural and marine products or manufactured products to multiply his or her interests in the purchase of the merchandise through the virtual experience of the raising or manufacturing of the merchandise by offering simulation software in a fixed period required for the raising or manufacturing. SOLUTION: The raising simulation software of agricultural or marine products or the manufacturing simulation software of manufactured products is offered through an Internet so that a purchase applicant can execute a simulation game in a fixed period, and obtain the merchandise at the time of finishing the execution. This selling managing device is provided with a Web server being the computer system of a management trader for accepting a selling request from a merchandise producer and a purchase application from the purchaser, and for managing the simulation execution of the purchaser.
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