Disclosed is a dummy touch screen system. The dummy touch screen system includes a host mobile terminal and a dummy touch screen. Here, the host mobile terminal includes a first touch screen unit having a first touch panel and a first display, a first application module driven by receiving a first touch signal generated by a touch of the first touch panel, a first display module receiving a first image signal output by a drive of the first application module, a first image communication module receiving a second image signal output by the drive of the first application module, and a first human interface device (HID) module transmitting a touch signal transmitted from the outside to the first application module. The dummy touch screen includes a second image communication module receiving the second image signal, a second display module receiving the second image signal from the second image communication module, a second touch screen unit having a second display displaying a second image display signal output by a drive of the second display module, and a second HID module receiving a second touch signal generated by a touch of the second touch panel.