Patent ID: 6240443
Filing Date: 2001-05-29
Classification: H04L

Abstract:
A communication server in a communication network including a plurality of user terminals and a plurality of network resources accessed by said user terminals, said user terminals each comprising: means for obtaining a resource locator which indicates a location of a network resource and for notifying said communication server of said resource locator; and means for notifying said communication server of a switched resource locator when said user terminal switches its access destination; said communication server comprising: a resource locator correspondence table which includes resource locators and user lists, each resource locator being associated with a user list which includes user terminals which access said each resource locator;means for distributing user terminal information in said user list to user terminals included in said user list;information exchanging means for receiving communication information from a first user terminal and sending said communication information to user terminals in said user list which includes said first user terminal, said communication information being used for communication among users of said user terminals;means for receiving said switched resource locator and updating said resource locator correspondence table on the basis of said switched resource locator;means for distributing user terminal information in the updated user list to user terminals in said updated user list; andwherein user terminals in a specific user list displays the same network resource image of a resource locator which corresponds to said specific user list while said user terminals in said specific user list exchange said communication information.