An electronic device having a flexible display and a method for operating the same are provided. The method includes displaying a first graphic user interface (GUI) for character input on a flexible display and detecting a change in a bending state of the flexible display. Changing the first GUI to a second GUI based on the detected change of the bending state of the flexible display, and then displaying the second GUI. In some embodiments, the method may include determining a moved area among the first area and the second area and displaying the second GUI based on the determined moved area and the angle between the first area and the second area. Determining the moved area may include detecting a first pressure corresponding to the first area and a second pressure corresponding to the second area, and then determining the moved area based on the first and second pressures.