A light emitting diode (LED) driving device is provided. The LED driving device includes a rectifier configured to rectify alternating current (AC) power to generate rectified power; an AC driver configured to control operations of a plurality of LED groups so that the plurality of LED groups receive the rectified power generated by the rectifier; and a light amount controller configured to reduce an amount of current applied to the plurality of LED groups when a peak value of the rectified power is increased, and increase the amount of current applied to the plurality of LED groups when the peak value of the rectified power is reduced.