E-book market has grown rapidly for several years, and its readers have advanced to support user interaction, multimedia, script, and other interesting features. In this paper, we introduce some design issues for an integrated e-book reader which consists of three different viewers (interactive e-book viewer, 3D model viewer, and augmented reality viewer), and supports HTML, user interaction, and multimedia. In the system, the e-book viewer is essential, and it is based on WebKit, so that it allows HTML-based contents to be published as e-books with little efforts. We also show a prototype system and its evaluation compared to other existing readers.