When executing an auction in a virtual reality space, a control part provides a predetermined period to one asking price of an article to be put for the auction and receives bidding signals from a plurality of participant terminals within the period. When a plurality of bidding signals income within the period, the auction is continued while raising the asking price step by step by the predetermined unit. When no bidding signal incomes within the period on the other hand, the auction is continued while lowering the asking price step by step by the predetermined unit. When a bidding signal incomes on the way, the auction is continued while raising the asking price step by step by the predetermined unit. All the bidding instruction signals which income within the predetermined period are equally processed whether early or late. When only one bidding instruction signal incomes within the predetermined period, the participant who transmitted the bidding signal is regarded as the final successful bidder. When the auction is completed, the control part calculates an idle time until the next auction and automatically selects one or more advertisement contents relative to an article for sale according to the calculated spare time.
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