The present invention provides a digital voice book library system which through Internet provides an customized digital audio version book that can be customized according to a learner's learning language, learning level, learning condition, learning taste or the like by a learner's selecting/varying audio attributes of the audio version book(digital audio file) associated with the equivalent printed script (hardcopy) version book that is owned by the learner or is borrowed from a conventional library or a book rental store. Wherein the audio attribute of said customized digital audio version book can be varied and customized in language, voice, speech speed or playback device at every repetition time according to user's learning language, learning level, learning condition or the like, corresponding to the equivalent script book despite different audio attribute. Using the present invention a learner can repeatedly listen to a same content audio version book without boring, therefore can acquire a good language ability in short time.