A user terminal device connected in a network is provided. The user terminal device includes a display to display a main user interface (UI) screen including therein a first install menu to install an application and a second install menu to install a driver, an input unit through which one of the first install menu and the second install menu is selected on the main UI screen, and a controller to carry out an application installation in which an application program is installed onto a device connected in the network, if the first install menu is selected, and carry out a driver program installation in which a driver program is installed onto the user terminal device, if the second install menu is selected. The controller causes the display to display a map image, indicative of an arrangement of devices in an environment where the network is constructed, and carries out the application program installation or the driver program installation onto the device selected from the map image.