Disclosed is an organic light emitting display device that displays images with uniform luminance by compensating degradation of organic light emitting diode, and a method for driving the same. The device comprises a display panel with sub-pixels, each sub-pixel having an organic light emitting diode for emitting light; a memory which stores accumulated data of each sub-pixel; and a panel driver which calculates an individual compensation gain value for each sub-pixel and a global compensation gain value for all the sub-pixels in common based on the accumulated data of sub-pixel, modulates input data for each sub-pixel through the individual compensation gain value and global compensation gain value, converts the modulated data into a data voltage, and accumulates the modulated data on the accumulated data of the corresponding sub-pixel and stores the obtained data in the memory.