A method of outputting a includes detecting a touch on a shortcut icon of a plurality of shortcut icons displayed on a touch screen, executing an application corresponding to the shortcut icon in response to the touch, detecting an angle between a first housing including a first touch screen and a second housing including a second touch screen by using a sensor, and determining an output mode based on the angle and a property of the application, and outputting a sound through a plurality of speakers according to the output mode.