In particular embodiments, an online trading system receives a product
registration request including product description from a user terminal.
Then, image information is extracted from the product description and a
resource locator of the image information is generated. Then, an image
list is generated based on the product description and the resource
locator of the image information. The image list is sent to a search
service DB server, where the image list is associated with a keyword
relevant to the product description. Further, the image list may be sent
to a UCC DB server. In this case, the UCC DB server generates a UCC
containing the image list and sends a resource locator of the UCC to the
search service DB server, which associates the resource locator of the
UCC with a keyword relevant to the product description. If the search
service server receives a search query including a keyword from a user
terminal, the search service server searches a search service database to
retrieve an image list or a resource locator of UCC containing an image
list relevant to the keyword.