ELECTRONIC DEVICE COMPRISING EXPANDABLE DISPLAY, AND USER INTERFACE PROVISION METHOD

An electronic device according to various embodiments of this document may include a first housing, a second housing coupled to slide relative to the first housing, a rollable display in which a display area is reduced or extended based on sliding-in or sliding-out of the second housing, and a processor operatively coupled to the rollable display, wherein the processor may be configured to display a screen of a running application on the rollable display when the rollable display is in a first state, detect an input for switching the rollable display from the first state to the second state, in response to the input, determine whether or not a screen state of the running application is able to be maintained when switching the state of the rollable display, and if the application is unable to maintain the screen state of the running application when switching the state of the rollable display as a result of the determination, display a graphic element indicating switching of the state of the rollable display on the rollable display.