A picture display system having two display devices and a base device for supplying picture signals to one of the display devices and capable of having bidirectional communication with the other display device is disclosed. The picture display system (1) is made up by a mobile display device (100), a base device (200) and a large format display device (300). The base device (200) sends picture signals to the display device (100) and to the large format display device (300). On a display image surface of the mobile display device (100), there is provided a touch panel for detecting the contact position contacted by a user for displaying a remote-control panel RP accepting an operating input from the user on the display image surface. An operating signal conforming to a display item of the remote-control panel RP, displayed at a contact position, detected by the touch panel, is generated and transmitted by wireless communication to the base device (200). This base device (200) selects the picture signals, supplied from the external inputting devices (400), as a supply source of picture signals, responsive to an operating signal, to transmit the so selected picture signals to the large format display device (300).