Provided are a mobile communication terminal and a method capable of transmitting an image during the execution of a mobile messenger service. A host terminal acquires image data in response to a request for image transmission and creates a first transmission packet of the image data. The first packet is sent to a client terminal through a packet data communication network at a specified period. Additionally, when receiving a second transmission packet of image data from the client terminal, the host terminal decodes and displays the received second packet.