| http://www.w3.org/ns/prov#value | - When the seller 114 sells a virtual region, the presenting portion 111 presents selling information including information of a unique identifier of a selling object, a message that represents that the seller 111 will sell the selling object, information about the seller 114, and the selling price to the public through a network (at step S1). [0112] The buyer 118 browses the selling information thr
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