An overdrive apparatus applied to a display system is provided. The overdrive apparatus includes an indication unit, an access circuit and a plurality of memories. The indication unit provides an indication signal corresponding to a scan line of an image frame. The access unit reads a first overdrive table from a first memory among the memories, and loads a second overdrive table to a second memory among the memories according to the indication signal. The first overdrive table and the second overdrive table respectively correspond to a first region and a second region of the image frame.