A system for searching products intelligently based on analysis of customer's purchasing behavior includes a search engine database, a product database configured to store a predetermined number of keyword information on each product, an input/output unit configured to receive keywords, product selection or order information, and output search results, a search unit configured to generate search results of the search engine database and the product database from the keywords, and a related keyword information update unit configured to update related keyword information of the product database depending on the product selection or the order information.