To provide a display device capable of using a part or all of a screen by an external equipment and transmitting input information to the external equipment.

A memory 4 for display stores data for display prepared by a CPU 1 and the external equipment 7 writes the data for the display to the memory 4 for the display through a bus B100 for connection and a CPU bus B1. A second transfer control part 5 transfers the data for the display from the memory 4 for the display to the display device 6 synchronously with the display timing of the display device 6. The external equipment 7 inputs the depressing information of a touch panel 3 through the bus B100 for the connection, the CPU bus B1, a first transfer control part 2 and a local bus B2.