19. The method of claim 14 , wherein publishing the advertisement includes: performing update procedures to synchronize two or more data stores of advertising information that is displayed to the user electronically.
14. A method of on-line advertising in electronic commerce comprising: selecting a business listing in accordance with a unique identifier uniquely identifying the business listing; selecting an advertising service from a menu displaying a plurality of available advertising services, each of said advertising services including: an advertisement format specific to the advertising service, an associated display area in which the advertising service is to be presented, the associated display area corresponding to one of a plurality of display areas, where the plurality of display areas include: a priority placement area, and at least one other placement area, and an associated advertiser priority indicating a particular order for presenting the advertising service relative to other advertising services; establishing the advertisement format as including presentation information specific to the advertising service such that the plurality of advertising services collectively include a plurality of different advertisement formats; and selecting a payment plan corresponding to said selected advertising service; creating an advertisement corresponding to said selected advertising service; generating an order for said selected advertising service and said advertisement; obtaining payment authorization; publishing the advertisement in said display area associated with said selected advertising service such that said advertisement is accessible via a server of a computer network, said advertisement presented in a particular order relative to other advertisements based on said advertiser priority associated with said selected advertising service; and generating charges for said selected advertising service.