An electronic device according to various embodiments may include: a housing, a battery, a flexible display including a first area and a second area extending from the first area and configured to move from the housing to change the size of an area visible to the front face of the electronic device, a sensor configured to identify information related to the size of the visible area of the display, and a processor, wherein the processor may be configured to: identify size information of the visible area of the display using the information received from the sensor, and control the display to display information related to an available usage time of the electronic device based on the identified size information and the remaining amount of the battery.