1. A portable terminal comprising: a first camera equipped at a first side of the portable terminal; a second camera equipped at a second side opposite to the first side of the portable terminal; a display equipped at the first side of the portable terminal; and a control unit configured to: acquire a first image through the first camera, acquire a second image through the second camera to display the first image and the second image on the display, detect and display a plurality of candidate composition regions in each of the first image and the second image by recognizing the first image and the second image, select a first composition region in the first image and a second composition region in the second image, based on the displayed candidate composition regions, compose a portion of the first image and a portion of the second image based on the first composition region selected in the first image and the second composition region selected in the second image, and display the composed image on the display.