PROBLEM TO BE SOLVED: To provide a game server capable of enhancing the motivation of a real user for acquiring an item.;SOLUTION: A game server includes an operation data reception unit 11a for receiving operation data for operating a virtual user formed in a virtual space from a terminal 3, an acquisition request reception unit 52 for receiving an acquisition request for acquiring an item on the basis of the operation data, and an owned item setting unit 53 for setting the item as an owned item of the virtual user. The owned item setting unit 53 includes a lottery table determination unit 501 for determining a plurality of lottery tables indicating item extraction probability that an arbitrary item is extracted, an expectation degree presentation unit 502 for presenting expectation degree information associated with an item winning probability, and an item extraction unit 503 that, upon receipt of an acquisition request, refers to arbitrary expectation degree information from a presented plurality of pieces of expectation degree information, and extracts an item set as an owned item on the basis of the lottery table associated with the expectation degree information that is referred to.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2017,JPO&INPIT
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