This paper describes graphic representation of the process of action based on guitar rendition ontology. We have systematized the knowledge of classical guitar for learning and teaching support, and developed guitar rendition ontology. The ontology defines action process of each rendition by using several properties. However, it is difficult to understand intuitively for players because the ontology presents specific description form. Therefore, in this study, we extracted the knowledge relevant to action from guitar rendition ontology and described action processes by graphical representation.