In this paper, we introduce an automatic media content creation system according to an impression. The system creates media content such as music, an image, etc. according to an impression given by a user. The impression is represented in words. Generally, there are two systems related to an impression. The first is a recognition system. The recognition system evokes an impression from media content. The other is a creation system. The creation system creates media content according to an impression. We construct a cycle of the impression via the recognition creation systems. In this cycle, it is mutual mapping between impressions and media contents. In this paper, we construct a recognition operator and a creation operator for realizing the impression cycle. Each operator is a relation of inverse calculation. We apply this system to music media. We introduce an automatic music creation system.