12. The computer-implemented method of claim 11 , wherein the information from the at least one advertiser document includes terms, each of the terms including one of a word and a phrase, wherein the index generated maps terms extracted from the at least one advertiser document back to one of (A) advertiser document identifiers for the at least one advertiser document on which the extracted terms are found, and (B) ad identifiers for ads generated from the at least one advertiser document on which such terms are found, and wherein the weights are determined as a function of at least one of (A) font size, (B) font attributes, and (C) Meta information, of the terms in the at least one advertiser document.
11. The computer-implemented method of claim 1 , wherein, in the index generated, the one of (A) advertiser document identifiers for the at least one advertiser document on which the extracted information is found, and (B) ad identifiers for ads generated from the at least one advertiser document on which the extracted information is found, includes weights.