An image processing apparatus, a display apparatus, and an image processing system and method, for displaying image data, are provided. The image processing apparatus includes a color gamut converter configured to convert a color gamut of at least a portion of an image received from the display apparatus, a controller configured to control the color gamut converter to convert color gamut of at least the portion of the image data based on region division information of a display image received from the display apparatus through the communicator and profile information for converting color gamut of a plurality of divided regions based on the region division information. Thus, the display apparatus displays image data converted into multiple-color gamut without an additional component for converting image quality and color gamut of the image data.