Estimating bid prices for keywords is disclosed, including: receiving a request to estimate a bid price associated with a target keyword for a bidder; determining whether the bidder has previously bid on the target keyword; in the event that the bidder has not previously bid on the target keyword, determining an estimated bid price based at least in part on a plurality of historical bid prices associated with the bidder corresponding to keywords other than the target keyword and a plurality of historical bid prices associated with other bidders corresponding to the target keyword; and in the event that the bidder has previously bid on the target keyword, determining the estimated bid price based at least on revising a current bid price associated with the request; and returning the estimated bid price associated with the target keyword.
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