To independently and clearly display plural image data on plural display parts.

This display device is provided with plural display parts 11, 12, 13 and a memory 50 having memory areas 21, 22, 23 corresponding to numbers of the display parts 11, 12, 13, and makes control parts 31, 32, 33 receive a request from a host 40 and control the write-in/read-out of the image data for the memory 50 and the transfer of the image data to the display parts 11, 12, 13. Further, the device makes a memory area control part 80 perform area switch control and management for plural memory areas 21, 22, 23 of the memory 50.