In this paper, we propose a method of automatic metadata extraction corresponding to impressions of the word's sounds. Generally, a word and a phrase evoke various impressions. The impressions are evoked by not only the semantics of the word but also its sound. Especially, sounds of words are important to understand mutual emotion effectively in our communication. In order to realize search corresponding to the impression of words, it is important that we realize extraction function based on impressions for the sounds of arbitrary words. The correlation relationships between impressions and sounds in Japanese are indicated by this research called “Onso” which means the aspect of sound in Japanese. This method realizes extraction of metadata corresponding to impressions by the sound of the words utilizing the research of “Onso”. We can realize the semantic associative search for impression of the sounds of arbitrary words by applying this method.