The goal of this paper is mainly to review and summarize the multimedia information formats and technical standards that have been applied so that library and information specialists can understand them systematically. The most fundamental differences between digital library and the classic one are specified by describing the general characteristics of hypermedia information environment. With the proprietary advantages of multimedia technology to digital library developments, the core technological standards (publicly available) of text and non-text data, including multimedia data, are reviewed. Finally, it describes some important and professional perspectives and roles of library practioners as well as researchers who are engaged with the innovation of digital library.