Provided is a wireless communication terminal having a function of providing an integrated messaging service. The wireless communication terminal includes: a wireless transceiver for transceiving a message to/from an outside device through a wireless network; a storage for storing an integrated messaging service program and messages; a keypad for receiving a message content and a menu selecting signal in the IUI; a displayer for displaying the message content and description data in the IUI; and a controller for providing the IUI to the keypad and the displayer, determining a message kind of the message to be transmitted, generating an outgoing message including identification data, transmitting the outgoing message, displaying the message content and the description data in the IUI, determining a message kind of a received message, dividing the received message into a message content and description data, and displaying the message content and the description data in the IUI.