Learning environment with e-book enables learners to learn anytime and anywhere they like according to their own pace.There is a large expectation on e-book as personal learning tool.Understanding and grasping the learning status of students is crucial matter for teachers and for the learning system.Access log of e-books should be basis for analyzing the learning behavior.The authors are constructing an analysis system of learning logs kept in BookLooper system operated in Kyushu University.The present paper overviews the system and shows some "learning log graphs" which represent the learning process of students.The graphs tell which pages a student had difficulties and if the student grasps the thread of course as the teacher expected.