1. An image display apparatus comprising: a display; a user input interface for receiving a control signal from a remote controller; a network interface for transmitting or receiving data over a network; a controller for controlling a pointer on the display according to the received control signal ; and a memory including platform for controlling data transmission or reception over the network according to the received control signal, wherein the platform includes an Operating System (OS) kernel and an application layer that runs on the OS kernel, the application layer including an installable or deletable application downloaded over the network.