Method, program and computer system for sharing annotation information added to digital contents

摘要

A mechanism for sharing information (annotation information) added to digital contents such as a Web page, by a plurality of users. An intermediate server is provided between a user's client terminal and a server managing digital contents. The user wishing to add annotation information to be shared, acquires the original digital contents via the intermediate server, not directly from the Web server. Then, the intermediate server caches the digital contents concerned and transmits them to the client terminal along with an annotation tool having a program for adding annotation information. Annotation information prepared by this annotation tool is stored in the intermediate server along with position information where it is displayed. For correlating the original digital contents and data about the annotation information with each other, a session key is produced as key information. The intermediate server produces address information (URL) for contents reproduction including data about the session key.