As data grew continuously in many MOOC(Massive Open Online Courses) organizations, the number of relationships among courses has also been increasing. The courses’ structures in the organizations were categorized based on subjects, but relationships among structures are not defined. Therefore, in this research we analyze the structures of courses in edX.org which is one of the largest organization of the MOOC organizations. In order to define the relationships among courses, firstly we extract keywords from all courses using TF-IDF weighting factor. Secondly, we construct a bipartite network between keywords and courses. Lastly, we visualize interactive networks of course and keyword to enable user to explore information of the organization. Moreover, we combine the network visualization with parallel coordinates to strengthen weak points of the network visualization. In summary, we not only analyze which topics are positioning in one MOOC organization, but also present an exploration analysis tools for navigating the organization.