Clientend interface customized instant communication method and system

The invention includes following steps: instance communication client end (ICCE) receives message sent from the other party being as natural person or some kind of programs, and the message contains description how to process itself; based on the said description, ICCE determines specific message process interface; displaying interface of described by the description to user of ICCE; through the interface, user carries out instant communication conversation to the other party. Thus, the invention can modify interface of ICCE without need of upgrading client end self. It is convenient for instant communication service provider to promote new function so as to increase practicability of system.