| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily find the address of a web page where an image is shown if a desired image is shown on the Internet. Ž<P>SOLUTION: A crawling engine 11 connects to a web page on the Internet 40 and obtains the URL of the web page, the URL of an image shown on the web page, and its image data. An image hash calculation device 12 calculates the hash value of the image collected and stores the hash value in an image database 30 in association with the URL of the web page where the image has been obtained, etc. A retrieval device (2) 24 obtains from the image database 30 the URL of the web page associated with the hash value output from the image hash calculation device 22, and a mail address extraction device 25 extracts a mail address from the web page of the URL, the result extracted being displayed in a retrieval result device 24. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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