To perform display control over a plurality of display screens that a display includes in simple circuit configurations.

The display includes a plurality of display units, a display controller provided in common for a plurality of display units, and a mask circuit provided between a plurality of display units and display controller. Each of a plurality of display units displays an image corresponding to display data based upon a display control signal. The display controller outputs the display control signal and display data to a plurality of display units in common. The display control signal includes a vertical synchronizing signal, a horizontal synchronizing signal, and a clock signal, and at least one of those vertical synchronizing signal, horizontal synchronizing signal, and clock signal is a signal to be masked. The mask circuit receives a display designation signal for designating at least one of a plurality of display units, supplies the signal to be masked to the display unit designated with the display designation signal and masks supply of the signal to be masked to other display units.