| 摘要 |
A retrieval part (231) retrieves commodities on the basis of predetermined retrieval conditions. A sorting part (232) sorts tags attached to the retrieved commodities into tag groups to which the tags respectively belong. With tag groups containing tags already used for the retrieval conditions being excluded from the sorted tag groups, a selection part (233) selects a tag group that satisfies a predetermined majority requirement. A generation part (234) generates a list page for listing the retrieved commodities. At this time, the generation part (234) generates the list page with the inclusion of a condition object indicating retrieval conditions being used and a narrowing-down object for narrowing down a commodity by using a tag in the selected tag group. A presentation part (240) presents the generated list page to a user. |
