The present invention relates to an organic light-emitting display device including a non-volatile memory in a panel part when the panel part is separated by a considerable distance from a timing control circuit such that the timing control circuit can be commonly used, and a data processing method of the organic light-emitting display device. A data driver of the panel part includes a memory and a converter and performs communication with the timing control circuit through a long-distance signal transmission system, or a bridge circuit board including a memory and a converter performs communication with the timing control circuit through a long-distance signal transmission system to transmit display panel compensation data, thereby commonly using the timing control circuit.