An enhanced instant messaging processing method is presented to users in an instant messaging communication environment. For a user having two or more communication terminals that have logged into a same instant messaging account of the user, a communication server monitors invitations sent to the instant messaging account. Responsive to one communication terminal responding to the invitation and the type of the response, the communication server generates a response policy for each of other communication terminals of the user, where the response policy optimizes the instant communication performance enhances the user experience. The disclosed embodiments also support simultaneous instant communications among a large number of users connected to multiple data processing servers. The disclosed solution for support simultaneous instant communications balances the load of the data processing servers while keeping multiple communication terminals of a user informed of the status of the instant communication.