Google is introducing a service called Base, which it said was intended to permit Internet users to upload files and other information to Google's servers and make them searchable by category.

Currently Google displays the results of queries as a simple list, ranked by relevance. Google Base would allow searchers to pull up information organized by any subject. Google, however, has not said how it will display information organized into groupings, like homes, cars or jobs. Initially, the service will be free.

During an interview at Google headquarters last week, Salar Kamangar, Google's vice president for product management, said the new service was experimental and cautioned against viewing it as a imminent assault on the classified advertising business because it could be used in far broader ways.

Still, several industry executives and analysts said they believed that Google Base was an aggressive first step in a series of maneuvers that would position the company as a powerful player in the $100 billion annual market for classified advertising.

The general industry perception is that Google could potentially transform that market, which has already been shaken by the rapid shift to online searching and the free listing services offered by Craigslist.

"It's very clear that Google is planning to launch a classified advertising product," Peter M. Zollman, publisher of Classified Intelligence Report, an industry newsletter. "It will be a huge threat to traditional classified businesses."

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