4. The Internet advertising system of claim 1 wherein the publication means selects a predetermined number of advertisement listings for a specific requested node.
1. An Internet advertising system for receiving advertisement information from advertisers for publication through a multi-node hierarchical content-based system, the Internet advertising system comprising: a communication interface for: sending a multi-level representation of at least a portion of the hierarchy of content nodes to a plurality of advertiser user systems to facilitate selection of one or more of the nodes, the hierarchy of content nodes providing a categorization of information and each content node being associated with one or more web pages, and receiving advertisement listing information from a plurality of advertiser user systems connecting to the Internet advertising system over the Internet, the advertisement listing information comprising an advertisement title and URL, a selection of one or more nodes with which the advertisement listing information is to be associated, and a bid amount for each node selected; a computer storage device for storing the advertisement listings; and a publication means for publishing web page content and advertisement listings to an end user requesting a page associated with a particular node within the multi-node hierarchical system, the publication means delivering content and one or more advertisements associated with the node.