A method of controlling a mobile terminal, comprising: - recognizing a first touch input and a second touch input sequentially input at a first touch screen (610; 720; 820;...), the first touch input to start at a first position on the first touch screen (610; 720; 820;...), wherein the first touch screen (610; 720; 820;...) corresponds to a sub display corresponding to a side output unit of the mobile terminal; - outputting, from a second touch screen (620; 710; 810;...), an indicator corresponding to the recognized first touch input and the second touch input, wherein the second touch screen (620; 710; 810;...)corresponds to a main screen corresponding to a front output unit of the mobile terminal, and the first touch screen (610; 720; 820;...) has a different direction than the second touch screen (620; 710; 810;...); - storing, in a memory, an unlock pattern based on the recognized first touch input and the second touch input; - recognizing a third touch input and a fourth touch input sequentially input at the first touch screen (610; 720; 820;...), the third touch input to start at a second position on the first touch screen (610; 720; 820;...); - outputting, from the second touch screen (620; 710; 810;...), an indicator corresponding to the recognized third touch input and the fourth touch input; - comparing the stored unlock pattern with the recognized third touch input and the fourth touch input; and - executing an unlock of the main display based on a result of the comparing; wherein in response to recognizing the third touch input at an end point of the first touch screen (610; 720; 820;...), the method further comprising adding distance information of a newly touched third touch input and distance information of a previously touched third touch input. - recognizing a first touch input and a second touch input sequentially input at a first touch screen (610; 720; 820;...), the first touch input to start at a first position on the first touch screen (610; 720; 820;...), wherein the first touch screen (610; 720; 820;...) corresponds to a sub display corresponding to a side output unit of the mobile terminal; - outputting, from a second touch screen (620; 710; 810;...), an indicator corresponding to the recognized first touch input and the second touch input, wherein the second touch screen (620; 710; 810;...)corresponds to a main screen corresponding to a front output unit of the mobile terminal, and the first touch screen (610; 720; 820;...) has a different direction than the second touch screen (620; 710; 810;...); - storing, in a memory, an unlock pattern based on the recognized first touch input and the second touch input; - recognizing a third touch input and a fourth touch input sequentially input at the first touch screen (610; 720; 820;...), the third touch input to start at a second position on the first touch screen (610; 720; 820;...); - outputting, from the second touch screen (620; 710; 810;...), an indicator corresponding to the recognized third touch input and the fourth touch input; - comparing the stored unlock pattern with the recognized third touch input and the fourth touch input; and - executing an unlock of the main display based on a result of the comparing;