| 摘要 |
Text data is input with an image to a server. At least one area which belongs to any one of predetermined categories is extracted from the image. Plural keywords belonging to the corresponding category are extracted from the text data. One feature quantity is obtained for the extracted area. A list table of feature quantity in which image feature quantities and keywords in the category are related to each other one by one is referred, and plural of the image feature quantities are retrieved based on the extracted plural keywords. One image feature quantity most similar to the obtained feature quantity is selected from among the plural image feature quantities. The list table of feature quantity is referred, and the keyword related to the selected image feature quantity is obtained. The obtained keyword is selected as metadata.
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