A portable device, comprising: an edge touch screen that has a main display area, a left edge display area and a right edge display area, each of the left edge display area and the right edge display area being extended and bended from the main display area with a single curvature or a multi-curvature; and a controller configured: to control the edge touch screen to display a first screen among a plurality of screens, and to control the edge touch screen to display a second screen different from the first screen among the plurality of screens based on a first direction of successive motions of a first touch detected on the left edge display area and the main display area and a second direction of successive motions of a second touch detected on the right edge display area and the main display area, wherein the controller is further configured to detect the successive motions of the first touch starting from a first location of the first touch detected on the left edge display area and to detect successive motions of the second touch starting from a first location of the second touch detected on the right edge display area, wherein a last location of the first touch is on the main display area, wherein a last location of the second touch is on the main display area, and wherein the second screen is a reduced version of the first screen. an edge touch screen that has a main display area, a left edge display area and a right edge display area, each of the left edge display area and the right edge display area being extended and bended from the main display area with a single curvature or a multi-curvature; and a controller configured: to control the edge touch screen to display a first screen among a plurality of screens, and to control the edge touch screen to display a second screen different from the first screen among the plurality of screens based on a first direction of successive motions of a first touch detected on the left edge display area and the main display area and a second direction of successive motions of a second touch detected on the right edge display area and the main display area, wherein the controller is further configured to detect the successive motions of the first touch starting from a first location of the first touch detected on the left edge display area and to detect successive motions of the second touch starting from a first location of the second touch detected on the right edge display area, wherein a last location of the first touch is on the main display area, wherein a last location of the second touch is on the main display area, and wherein the second screen is a reduced version of the first screen. to control the edge touch screen to display a first screen among a plurality of screens, and to control the edge touch screen to display a second screen different from the first screen among the plurality of screens based on a first direction of successive motions of a first touch detected on the left edge display area and the main display area and a second direction of successive motions of a second touch detected on the right edge display area and the main display area, wherein the controller is further configured to detect the successive motions of the first touch starting from a first location of the first touch detected on the left edge display area and to detect successive motions of the second touch starting from a first location of the second touch detected on the right edge display area, wherein a last location of the first touch is on the main display area, wherein a last location of the second touch is on the main display area, and wherein the second screen is a reduced version of the first screen.