A mobile terminal includes an input unit receiving an input; a data storage unit storing data; a communication unit communicating signals; and a controller. The controller is configured to receive a selection input of a video data, the selection input being processed to select the video data among a plurality of video data stored in the data storage unit; temporarily store a selected portion of the video data for transmission based on a start position and a stop position specifying the selected portion in the video data; automatically attach the selected portion of the video data for transmission to a message without receiving any further user input when the selected portion of the video data is specified; transmit the message with the selected portion of the video data; and delete the selected portion of the video data from the data storage unit when the transmission of the message is completed.