In this paper,we present a meaningful learning environment to visually support e-book learners to effectively construct their knowledge framework.This personalized visualization support is intended to encourage learners to actively locate new knowledge in their own knowledge framework and check the logical consistency of their ideas for clearing up misunderstandings.On the other hand,we also propose to visually support e-book instructors to decide the group distribution for collaborative learning activities based on knowledge structure of learners.To facilitate those visualization supports,we present a method to semi-automatically construct a course-centered ontology to describe the required information in a map structure.