A display apparatus includes a display part to display an image thereon, a video signal processor to convert an input video signal into a signal having a format displayable by the display part, a network controller connectable to a network to transmit and receive data according to a predetermined protocol, a data processor to process the data transmitted and/or received through the network controller into a video signal processible by the video signal processor, and a controller to control power to be supplied to the data processor according to whether the data is being transmitted and/or received by the network controller through the network. Accordingly, the display apparatus transmits and receives data through a network and reduces power consumption.