An information processing device includes: a control means for causing the player to acquire a content in response to a game execution instruction from the player; an extraction means for extracting content groups of the same type from contents possessed by the player, according to an instruction from the player; a selection means for automatically selecting fusion source contents and resource contents from each of the extracted content groups; and a fusion means for collectively fusing, for each of the fusion source contents, one of the resource contents of the same type as the each of the fusion source contents. The selection means selects, as the resource contents, contents having a rarity at or below a specific level, from each of the extracted content groups.