Abstract: The present invention is designed to supply an automated solution for the publishing of one or more ads in multiple pages of websites. Embodiments of the present invention enable website owners to automatically present commercial advertisements on their websites while ensuring that the content of the automatically selected ads does not conflict with the content of the website. According to embodiments of the present invention the proposed system and method enables the classifying of one or more ads and website pages, according to predefined categories and key words. Thus, website owners and advertisers can optionally define their own categories as well as the categories to which they wish to be associated with.