A contextual advertising system depends on embedded decision-influence algorithms to parse the keywords in web-user searches to identify the public search-engine networks best able to respond with the most relevant advertisement results. Marketing managers control which kind of advertisements get automatically selected by planting product/service, price, place and promotion (4P) keywords which correlate to each of the four traditional Marketing Mix categories. Language-independent, proximity pattern matching algorithms are used to increase matching accuracy and customer click-through-rates (CTR) and their ultimate purchase decisions. Each 4P Marketing Mix contextual smart-advertisement can be independently displayed in full, or linked to an existing online advertisement to enhance match accuracy and the CTR.