2. The method of claim 1 wherein: the providing includes providing a first and a second transition probability distribution indicating probability of transitioning from one document to another document using a link; the determining of the first ranking includes determining a first stationary probability distribution based on the first transition probability distribution indicating a stationary probability of transitioning to each document; and the determining of the second ranking includes determining a second stationary probability distribution based on the second transition probability distribution and the first stationary probability distribution wherein the second stationary probability distribution represents the second ranking of the documents.
2. The method of claim 1 wherein: the providing includes providing a first and a second transition probability distribution indicating probability of transitioning from one document to another document using a link; the determining of the first ranking includes determining a first stationary probability distribution based on the first transition probability distribution indicating a stationary probability of transitioning to each document; and the determining of the second ranking includes determining a second stationary probability distribution based on the second transition probability distribution and the first stationary probability distribution wherein the second stationary probability distribution represents the second ranking of the documents. 5. The method of claim 2 wherein the documents are web pages and the first and second transition probability distribution is generated based on the links between the web pages.