Bended display device for controlling function of application through image displayed on sub-region, and control method therefor

A bended display device, the device comprising:

• a bended display containing a main region located on a front side of the device and a sub-region extended from the main region and having a prescribed curvature;
• and
• a control unit configured to:
• control a function of the device;
• when a first touch input is received on an icon of an application displayed on the sub-region, transform the icon into a button image such that the button image is displayed instead of the icon on the sub-region, wherein the first touch input comprises dragging the icon in a first direction away from the main region, wherein the button image has a switch form, and wherein the button image has a size smaller than a size of the icon of the application;
• when a second touch input is received on the button image execute a function corresponding to the second touch input among a plurality of functions of the application;
• and
• when a third touch input is received on the button image, re-transform the button image into the icon of the application such that the icon is displayed instead of the button image on the sub-region, wherein the third touch input comprises dragging the button image in a second direction toward the main region.