To provide a display device displaying an input picture on the center of a display panel without requiring fine adjustment in accordance with a host system connected to the device.

A control means 4 controls a menu means 7 by operating a switch 3, outputted new data 4X is switched by a selecting means 6 and superimposed and displayed on a display panel A, further, a host system 1 connected to the display panel A form the menu data 4X is set by operating switch 3. After that, the control means 4 reads out a clock parameter of the set host system 1 and a position parameter 5X from a storing means 5, outputs the number of frequency division 4Y to a clock means 8, outputs a clock signal 8X, also outputs a position parameter 9X to a position means 9, and picture data 6X is displayed on the center of the display panel A.