The invention relates to data accessing method and apparatus, and more particularly to data accessing method and apparatus for accessing a first-in first-out (FIFO) buffer compatible with mini-low voltage differential signal (mini-LVDS) transmission interface. The image data accessing apparatus comprises a FIFO memory for storing the image data, and a controller for accessing the FIFO memory in circular manner; wherein the controller writes the image data in pixel-basis and reads the stored image data in channel-basis.