An electronic device and an operation method therefor are provided. The electronic device may include: a display panel; an optical element; and a control unit which senses a location of the optical element, generates a 3D image through via display panel and the optical element in a state in which the display panel and the optical element overlap each other, and generates a 2D image via the display panel in a state in which the optical element is detached or separated from the display panel.