When a particular game stage is selected by the player from the multiple game stages configured in the game stage information, the inventive information processing device extracts, from multiple game content objects configured in the game content information, those game content objects that are associated with the game content objects, which are associated with the selected game stage as fusion source material, and, prior to initiation of game play in the selected game stage, generates screen data providing on-screen display indicating that the extracted game content objects are the original pre-fusion game content objects that can be fused with the game content objects, which are associated with the selected game stage as fusion source material.