A method for generating a combined signal in a mobile terminal equipped with a camera that captures image signals. A captured image signal is coded into a still picture signal based upon a frame size. A received audio signal is coded. An image header containing image pattern information and frame size information is inserted into the still picture signal based upon the frame size. The still picture signal based upon the frame size into which the image header is inserted is combined with the coded audio signal. While the above-described operations are repeated, consecutive still picture signals based upon the frame size are combined with corresponding audio signals. When a recording operation is completed, a combined signal representative of a result of the combining is stored in a moving picture file.