A device includes: a memory storing a deck having multiple game content objects with levels of rarity; a lottery game processing module conducting a lottery drawing for selecting a particular game content object from game content objects of a rarity level or higher among all the game content objects contained in the deck in response to a lottery drawing operation by the player, and awards the game content object selected in this lottery drawing to the player; and an update processing module which, each time the lottery drawing is conducted, performs an update of the deck by deleting the game content object awarded to the player among the game content objects of at least the preset rarity level and game content objects not awarded to the player among the game content objects, excluding the highest-rarity game content objects from the game content objects of the preset rarity level or higher.