A game data processing section 100 is provided with an item assessment section 41 and an event generation section 42. The item assessment section 41 assesses whether or not the number of pieces of a virtual item possessed by a virtual user is equal to or more than a predetermined threshold value, extracts one type of virtual item from among virtual items possessed by the virtual user, and assesses whether or not the number of pieces of the one type of virtual item is equal to or more than the predetermined threshold value. The event generation section 42 generates an event in which the one type of virtual item can be consumed, when the item assessment section assesses the number of pieces of the one type of virtual item is equal to or more than the predetermined threshold value.