A display device having a network function according to an exemplary embodiment is configured to include: a network interface unit that performs data communication with external displays through a network; and a controller that transmits access request signals to the external display devices through the network interface unit and receives a list of input sources information that access is permitted based on the access permission or not according to the access request, wherein the controller transmits a request signal of an image program according to specific input sources based on the received list to the external display devices.