Display device, display system and method for controlling display device

A display system comprising:

• an image providing apparatus configured to provide an image signal;
• a display apparatus configured to process an image corresponding to an image signal provided from the image providing apparatus;
• and
• a remote controller,
• wherein the display apparatus is configured to:
• based on a control signal being received from the remote controller while the image is displayed, process a UI corresponding to an external device to be displayed according to whether an object is included in the image,
• wherein the display apparatus, based on an UI indicating a channel change being displayed in the image, processes an UI for changing a channel to be displayed,
• wherein the UI for changing a channel includes a scroll UI and an indicator, and
• wherein the display apparatus, based on the control signal being received while the UI for changing a channel is displayed, processes the indicator to be moved up or down on the scroll UI for a searching channel.

A method for controlling a display apparatus comprising:

• processing an image corresponding to an image signal provided from an external device;
• and
• based on a control signal being received from a remote controller while the image is displayed, processing the image with a UI for changing a channel based on the image not including a specific object and processing the image without the UI for changing a channel based on the image including the specific object,
• wherein the processing the image with the UI for changing a channel comprises:
• based on an UI indicating a channel change being displayed on the display apparatus, processing the UI for changing a channel to be displayed, wherein the UI for changing a channel includes a scroll UI and an indicator, and
• based on the control signal being received while the UI for changing a channel is displayed, processing the indicator to be moved up or down on the scroll UI for a searching channel.