Provided are a method and a system for providing a virtual messenger service between a mobile communication terminal and a computer. The method includes executing a virtual messenger program for controlling a function of a mobile communication terminal, and receiving a telephone directory provided within the mobile communication terminal; displaying a messenger window when receiving a request for activating the messenger window that collectively includes the telephone directory and menus; generating a communication event message related with a selected telephone number of the other party; and transmitting the generated event message to the mobile communication terminal, and displaying a notification of a communication event to an other party.