Flexible display device and operating method thereof

A flexible display device comprising:

• a display extendable from the device;
• a sensor configured to detect an extended amount of the display;
• and
• a controller configured to:
• display a home screen on an exposed portion of the display, wherein the exposed portion is visible prior to extending of the display;
• display a plurality of folders on the home screen each respectively comprising an application icon corresponding to an application, wherein the plurality of folders are displayed on the exposed portion of the display;
• and
• detect, via the sensor, extension of the display to expose an additional portion of the display corresponding to a first extended amount;
• compare a total number of times applications included in a first folder of the plurality of folders have been executed during a certain period with a total number of times applications included in a second folder of the plurality of folders have been executed during the certain period,
• determine a folder between the first folder and the second folder to be displayed on an extended home screen portion according to the comparison, and
• move and enlarge the determined folder including the corresponding application icon among the first folder and the second folder to the extended home screen portion,
• wherein the extended home screen portion has a size corresponding to the first extended amount and is displayed on the exposed portion of the display at a side corresponding to a direction in which the display is extended, and
• wherein the home screen is displayed on a remainder of the exposed portion and the additional exposed portion.