In a driving circuit and its driving method for driving a liquid crystal display device without using a pre-processor, the driving circuit includes a first timing controller for receiving a first part of digital image data, a second timing controller for receiving a second part of the digital image data, and a plurality of data drivers, each of which is electrically connected to both the first timing controller and the second timing controller to receive the first part or the second part of the digital image data through the first timing controller or the second timing controller, respectively, for driving the liquid crystal display device.