Electronic device including flexible display and method of operating the same

An electronic device comprising:

• a housing including a first housing and a second housing movably coupled to the first housing;
• a battery;
• a flexible display, wherein a size of a display area of the flexible display, which is exposed to outside of the electronic device, is changed from a first size to a second size based on a movement of the second housing;
• at least one processor comprising processing circuitry;
• and
• memory including one or more storage mediums storing instructions which, when executed by the at least one processor, cause the electronic device to:
• identify a power level of the battery,
• display a first screen on the display area corresponding to the first size,
• when the power level of the battery is greater than a first level, while the size of the display area is being changed from the first size to the second size, display a second screen by redrawing the first screen according to the changing size of the display area, wherein screen redrawing is continuously performed in response to a rolling movement or a sliding movement of the flexible display, and
• when the power level of the battery is less than or equal to the first level, while the size of the display area is being changed from the first size to the second size, display a second screen without redrawing in the first screen, and display, after a size of the display area changes to the second size, a third screen by redrawing the first screen according to the second size of the display area.