Today, the electronic book (e-book) market is growing rapidly and people can choose e-books that they would like to read from a large amount of e-books on the Internet. In order to support people to select books, many techniques for searching and recommending books have been proposed. However the user would have to decide whether each book in candidates is worth reading. Performing a query on a book is effective when they know what they want to know, so it is not effective at unread-novel. In this paper, we propose a browsing interface for supporting a user to decide whether he/she reads an e-book novel or not effectively. Our interface allows the user to select browsing sentences in the novel efficiently by an attractiveness map, which visualizes the transition of attractiveness in the novel according to its story flow. Characteristic keywords are assigned to characteristic points on the attractiveness map and the user can grasp an overview of the story flow effectively.