Ask Jeeves also syndicates its search technologies and advertising products to other Web sites, including, InfoSpace, BellSouth, Mamma.com and CNET Networks--the parent company of News.com.
Terms of the deal, announced Wednesday, were not disclosed. Lycos.com had previously used technology from Yahoo's Inktomi unit.
Adam Sciroco, an executive at, which is a unit of South Korean Web site operator Daum Communications, said that Ask Jeeves technology was already being used on other Lycos Web properties.
"The decision to switch (came) because we felt that the relationship with Jeeves provided us with a broad Web search solution (and) gave us the flexibility and the ability to differentiate our products later this year," he said.