The move is part of a 'refresh' strategy of the Dogpile service (www.dogpile.co.uk), scheduled for the start of May.
Alex Hurd, director of search and directory services at InfoSpace Europe, explained: "With Thomson WebFinder we will be able to get more local merchants on our service. Teoma is one of the leading quality search engines and this will increase the relevance of our searches."
The two-year agreement with Thomson WebFinder is on a revenue-sharing basis.
Dogpile will also be launching a 'blended results' product, which will boost the existing service that offers results grouped by search engine.
"This takes out duplicates - you're getting pure metasearch," Hurd pointed out.
The level of advertising on the web site is also being stripped down, so that users have an uncluttered experience, according to Hurd. Most ads are being taken off the home page, although there will still be keyword advertising on the search results page.
In the last six months alone, the number of searches has tripled from 500,000 to 1.5 million per month, according to the company.
Separately, InfoSpace has been chosen by lastminute.com to provide an SMS newsletter service for mobile phone users.
Customers will be able to select the newsletters they wish to receive, based on individual category interests, and will then be notified of selected offers on items such as gifts, holidays and entertainment.