Method and System of Annotation for Electronic Documents

The present invention provides a method of annotation for electronic document, a method for creating, modifying and browsing an annotation in an electronic document, and an apparatus and system for editing, browsing annotations in electronic document. The method of annotation for electronic document includes: storing annotation contents for one or more electronic documents into a shared dictionary; and when a reader browses an electronic document, providing the reader with annotations for the electronic document based on the shared dictionary.