An electronic device includes an extendable support including a first structure and a second structure to receive at least a portion of the first structure and guide relative movement of the first structure with respect to the second structure, a display having compact and expanded positions based on the relative movement of the first structure, a motor to generate an output force to cause the relative movement of the first and second structures, a sensor to detect a posture in which the electronic device is positioned, and a processor to change the output force of the motor based on the posture of the electronic device detected by the sensor.