Provided herein is a functionality extending kit of a display apparatus, the kit including a receiver which enables content to be viewed using an inserted card; a tuner configured to tune to a channel; an extending connector including a standard pin area connected to a signal line of a standard card and an additional pin area connected to a predetermined signal line; and a controller configured to control the tuner to tune to a channel that may transmit firmware update data associated with the card when the display apparatus connected to the extending connector is at a picture off state; wherein the functionality extending kit receives standby power from the display apparatus through a power pin provided in the additional pin area.