Many users benefit from decision support systems (DSS), but sometimes they can’t readily comprehend the nature or meaning of the outcome from DSS. In general, interpretation of data is much more intuitive if the results from the DSS are translated into charts, maps, and other graphical displays because visualization exploits our natural ability to recognize and understand visual patterns. In this paper we discuss the concept of visualization user interface (VUI) for decision support systems on commerce (CDSS). An information visualization model for CDSS is proposed, which consists of three elements. In addition, a visualized information retrieval engine based on fuzzy control is proposed.