To make it possible for a user to smoothly find content which satisfies the user's current taste without the need to carry out a troublesome input operation. Each of the content reproduction devices reproduces a content selected from among one or more reproduction object contents according to designation by the user. The content presentation assistance server analyzes, for every user attribute, relevance of one or more symbols relevant to each of the contents reproduced according to the designation of the user having that user attribute, and sends an analyzed result to the content reproduction used by the user having user attribute relevant to that analyzed result. Each of the content reproduction devices acquires, for the content, one or more relevant symbols, and displays content relevance information which describes the relevance of the reproduction object contents based on the symbols and the analyzed result.