A display data controlling method of an electronic device is provided. The display data controlling method includes transferring a first image of a first color bit format from a processor of the electronic device to a display unit of the electronic device or being functionally connected with the electronic device; detecting, by the processor, a screen transition; converting, by the processor based on the detection, a color bit format of second image corresponding to the screen transition into a second color bit format; and transferring the second image which is converted into the second color bit format from the processor to the display unit through an interface.