An information processing terminal device includes: a communication unit; a primary content information acquiring unit for acquiring primary content information; a primary content information holding managing unit for holding and managing primary content information, in correlation with a unique primary content identifier; a subsidiary content information holding managing unit for obtaining subsidiary content information configured having at least playback control information and having a subsidiary content identifier corresponding to itself and an editing history identifier; an editing processing unit for executing editing processing with secondary usage of at least one of primary content information and subsidiary content information; a subsidiary content information creating unit for creating subsidiary content information; an editing history identifier managing unit for generating the editing history identifier; and a subsidiary content identifier managing unit for generating a subsidiary content identifier to be correlated with subsidiary content information and providing this to subsidiary content information.