According to an embodiment, an electronic device may include an illuminance sensor including a first modulator obtaining a first signal for first illuminance values during a first integration time and a second modulator obtaining a second signal for second illuminance values during a second integration time, and a processor. The processor may be configured to calculate the first illuminance values and the second illuminance values based on the first and second signals, determine that an ambient light source is a flickering light source based on the second illuminance values, if obtaining display parameter information associated with an image output through the display, compensate for the first illuminance values based on the display parameter information and adjust a brightness value of the display based on the compensated first illuminance values, and if failing to obtain the display parameter information, adjust the brightness value of the display based on the second illuminance values.