A method of providing active web user interface is disclosed. The method includes questioning a web server about a message from an application program module by Asynchronous JavaScript and XML (AJAX). The web server asks the application program module to confirm receipt of the message. The web server obtains a result from the application program module, and returns to the web user interface control module. The web user interface receives the message from the web server and calls a plug-in module to provide a service about the message. The plug-in module starts the service of the application program module.