A display device comprising: a LED display comprising a plurality of LED display modules (110-1, 110-n) configured to share power through connections between power sharing terminals of the plurality of the LED display modules (110-1, 110-n), wherein each of the plurality of LED display modules (110-1, 110-n) comprises a sub processor for controlling an operation of each LED display module; and a display driver comprising a plurality of driving modules (120-1, 120-n) connected to the plurality of LED display modules (110-1, 110-n), respectively and characterised in that the display device further comprises: a storage that stores current control information for each luminance of a display element, maximum luminance level information for each power provided to the LED display module, and current gain value for each sub-pixel corresponding to each of the plurality of LED display modules (110-1, 110-n), wherein the current control information includes current control information for each luminance of each sub-pixel calibrated based on luminance and color characteristics according to a current of each of the sub-pixels constituting the plurality of LED display modules; and a processor configured, for each image and based on the image data, to calculate an individual consumed power amount of each of the plurality of LED display modules (110-1,110-n); calculate the maximum power amount available for each of the plurality of LED display modules (110-1, 110-n) based on a total power capacity that is provided by the plurality of driving modules (120-1, 120-n) and an individual consumed power amount of each of the plurality of LED display modules (110-1, 110-n); calculate a peak luminance level of each of the LED plurality of display modules (110-1, 110-n) based on the maximum luminance level information for each power and the maximum power amount available for each of the plurality of display modules (110-1, 110-n); and drive the plurality of driving modules (120-1, 120-n) so that each of the plurality of LED display modules (110-1, 110-n) has the calculated peak luminance level based on the current control information, and wherein the processor obtains the current gain value for each sub-pixel corresponding to each of the plurality of LED display modules (110-1, 110-n) so that each of the plurality of LED display modules (110-1 110-n) has the calculated peak luminance level from the storage, and controls a driving state of each of the plurality of LED driving modules (110-1, 110-n) based on the obtained current gain value for each sub-pixel. a LED display comprising a plurality of LED display modules (110-1, 110-n) configured to share power through connections between power sharing terminals of the plurality of the LED display modules (110-1, 110-n), wherein each of the plurality of LED display modules (110-1, 110-n) comprises a sub processor for controlling an operation of each LED display module; and a display driver comprising a plurality of driving modules (120-1, 120-n) connected to the plurality of LED display modules (110-1, 110-n), respectively a storage that stores current control information for each luminance of a display element, maximum luminance level information for each power provided to the LED display module, and current gain value for each sub-pixel corresponding to each of the plurality of LED display modules (110-1, 110-n), wherein the current control information includes current control information for each luminance of each sub-pixel calibrated based on luminance and color characteristics according to a current of each of the sub-pixels constituting the plurality of LED display modules; and a processor configured, for each image and based on the image data, to calculate an individual consumed power amount of each of the plurality of LED display modules (110-1,110-n); calculate the maximum power amount available for each of the plurality of LED display modules (110-1, 110-n) based on a total power capacity that is provided by the plurality of driving modules (120-1, 120-n) and an individual consumed power amount of each of the plurality of LED display modules (110-1, 110-n); calculate a peak luminance level of each of the LED plurality of display modules (110-1, 110-n) based on the maximum luminance level information for each power and the maximum power amount available for each of the plurality of display modules (110-1, 110-n); and drive the plurality of driving modules (120-1, 120-n) so that each of the plurality of LED display modules (110-1, 110-n) has the calculated peak luminance level based on the current control information, and wherein the processor obtains the current gain value for each sub-pixel corresponding to each of the plurality of LED display modules (110-1, 110-n) so that each of the plurality of LED display modules (110-1 110-n) has the calculated peak luminance level from the storage, and controls a driving state of each of the plurality of LED driving modules (110-1, 110-n) based on the obtained current gain value for each sub-pixel.