An electronic device (100;400;500;700;800;900;1000;1100;1200;1300;1400; 1500; 1600;1700;1800;1900;2000;21002200;2300;2400), comprising: a flexible display comprising a plurality of main areas and a sub-area, wherein the plurality of main areas comprises a first main area configured to be disposed on a front surface of the electronic device and a second main area configured to be disposed on a rear surface of the electronic device, and the sub-area is an area extended from the first main area and the second main area to be disposed on at least one side surface of the electronic device, and wherein in the flexible display, the main areas and the sub-area are integrally formed, at least part of the sub-area has a rounded shape and, the first main area and the second main area are both flat surfaces; and a controller configured to control an electronic device function operation based on the flexible display, wherein the controller controls to: display a plurality of icons corresponding to an application or a specific function in at least one area of the sub-area of the flexible display, detect an input for selecting at least one icon of the plurality icons in the sub-area in which the plurality icons are displayed, and based on detecting a swipe input of the selected at least one icon in the sub-area being terminated in the first main areas of the flexible display: execute the application corresponding to the selected at least one icon, and display a screen according to the execution in the first main area where the swipe input is terminated, detect a swipe input of the selected at least one content on the first main area to the second main area through the sub-area, and display additional information related to selected at least one content in the second main area. a flexible display comprising a plurality of main areas and a sub-area, wherein the plurality of main areas comprises a first main area configured to be disposed on a front surface of the electronic device and a second main area configured to be disposed on a rear surface of the electronic device, and the sub-area is an area extended from the first main area and the second main area to be disposed on at least one side surface of the electronic device, and wherein in the flexible display, the main areas and the sub-area are integrally formed, at least part of the sub-area has a rounded shape and, the first main area and the second main area are both flat surfaces; and a controller configured to control an electronic device function operation based on the flexible display, wherein the controller controls to: display a plurality of icons corresponding to an application or a specific function in at least one area of the sub-area of the flexible display, detect an input for selecting at least one icon of the plurality icons in the sub-area in which the plurality icons are displayed, and based on detecting a swipe input of the selected at least one icon in the sub-area being terminated in the first main areas of the flexible display: execute the application corresponding to the selected at least one icon, and display a screen according to the execution in the first main area where the swipe input is terminated, detect a swipe input of the selected at least one content on the first main area to the second main area through the sub-area, and display additional information related to selected at least one content in the second main area. display a plurality of icons corresponding to an application or a specific function in at least one area of the sub-area of the flexible display, detect an input for selecting at least one icon of the plurality icons in the sub-area in which the plurality icons are displayed, and based on detecting a swipe input of the selected at least one icon in the sub-area being terminated in the first main areas of the flexible display: execute the application corresponding to the selected at least one icon, and display a screen according to the execution in the first main area where the swipe input is terminated, detect a swipe input of the selected at least one content on the first main area to the second main area through the sub-area, and display additional information related to selected at least one content in the second main area. execute the application corresponding to the selected at least one icon, and display a screen according to the execution in the first main area where the swipe input is terminated, detect a swipe input of the selected at least one content on the first main area to the second main area through the sub-area, and display additional information related to selected at least one content in the second main area.