A display apparatus comprising: an external device control interface arranged to communicate with an external image providing apparatus which provides content to the display apparatus; a display ; a memory configured to store at least one instruction; and a processor configured to execute the at least one instruction stored in the memory so as to: obtain channel information based on channel information contained in the external image providing apparatus; receive continual press signals corresponding to a long press input for a channel control; based on a first press signal among the continual press signals of the long press input, transmit a channel control signal corresponding to the first press signal to the external image providing apparatus via the external device control interface, to change a current channel of the external image providing apparatus; based on one or more press signals following the first press signal among the continual press signals of the long press input, perform a channel scroll using a channel scroll user interface (UI) to select a target channel based on the channel information; and based on receiving an input corresponding to a release of the long press input, transmit, to the external image providing apparatus via the external device control interface, information associated with the target channel selected via the channel scroll. an external device control interface arranged to communicate with an external image providing apparatus which provides content to the display apparatus; a display ; a memory configured to store at least one instruction; and a processor configured to execute the at least one instruction stored in the memory so as to: obtain channel information based on channel information contained in the external image providing apparatus; receive continual press signals corresponding to a long press input for a channel control; based on a first press signal among the continual press signals of the long press input, transmit a channel control signal corresponding to the first press signal to the external image providing apparatus via the external device control interface, to change a current channel of the external image providing apparatus; based on one or more press signals following the first press signal among the continual press signals of the long press input, perform a channel scroll using a channel scroll user interface (UI) to select a target channel based on the channel information; and based on receiving an input corresponding to a release of the long press input, transmit, to the external image providing apparatus via the external device control interface, information associated with the target channel selected via the channel scroll. obtain channel information based on channel information contained in the external image providing apparatus; receive continual press signals corresponding to a long press input for a channel control; based on a first press signal among the continual press signals of the long press input, transmit a channel control signal corresponding to the first press signal to the external image providing apparatus via the external device control interface, to change a current channel of the external image providing apparatus; based on one or more press signals following the first press signal among the continual press signals of the long press input, perform a channel scroll using a channel scroll user interface (UI) to select a target channel based on the channel information; and based on receiving an input corresponding to a release of the long press input, transmit, to the external image providing apparatus via the external device control interface, information associated with the target channel selected via the channel scroll. <EOS>