A content management system for managing contents including at least one of a video image and an audio, which are received from a network or a broadcast including a wired or wireless connection and are stored in a storage device for storing the received contents in association with content information, includes a human relationship table which records information relating to a plurality of entries utilizing the content management system, an entry searching section which searches one of entries as a query destination of an evaluation relevant to designated contents stored in the storage device, using the human relationship table, a content evaluation information acquisition section which acquires evaluation information from the query destination with respect to the designated contents, and a content reduction section which determines a method of reducing the designated contents based on the evaluation information.