An apparatus and a method for generating overdriving values are provided, used to generate the overdriving values for displaying image data. The apparatus for generating overdriving values includes an outside environment sensor unit and an adjustment module. The outside environment sensor unit is for detecting at least an environment parameter. The adjustment module, electrically coupled with the outside environment sensor unit, receives environment parameters, generates and outputs the adjustment overdriving values according to the environment parameters. The above-mentioned environment parameters include at least one of a frame rate and a temperature.