In recent years, due to the wide spread of photo sharing Web sites such as Flickr and Picasa, we can put our own photos on the Web and show them to the public easily. To make the photos searched for easily, it is common to add several keywords which are called as "tags" when we upload photos. However, most of the tags are added one by one independently without much consideration of association between the tags. Then, in this paper, as a preparation for realizing simultaneous recognition of nouns and adjectives, we examine visual relationship between tags, particularly noun tags and adjective tags, by analyzing image features of a large number of tagged photos in social media sites on the Web with mutual information. As a result, it was turned out that mutual information between some nouns such as "car" and "sea" and adjectives related to color such as "red" and "blue" was relatively high, which showed that their relations were stronger.
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