Methods and devices for generating Graphical User Interface (GUI) for displaying are provided, wherein the GUI is generated based on a plurality of windows. The method for generating GUI includes the step of: separately drawing a plurality of pictures into the plurality of windows by a first graphical processing unit; and selecting the first graphical processing unit or a second graphical processing unit according to a predefined rule to compose the plurality of windows with pictures into a frame buffer, such that the GUI is obtained; wherein the first graphical processing unit and the second graphical processing unit are different.