Method for displaying a channel scroll bar and a channel indicator when a channel-up or channel-down button is continuously pressed and for tuning to the highlighted channel at the time the button is released

An image display device comprising:

• a user interface configured to receive a channel change command comprising at least one of a channel-up command and a channel-down command;
• a display;
• a processor;
• a receiver configured to receive a broadcast signal that corresponds to a channel of a plurality of channels;
• and
• a memory configured to store instructions that, when executed by the processor, cause the processor to:
• store channel information corresponding to the plurality of channels in the memory;
• determine whether a channel change command received via the user interface is a single channel change command causing a channel number to increment by one or a continuous channel change command causing a channel number to continuously increment on a channel-by-channel basis;
• in response to determining that the channel change command is the single channel change command, change a current channel from a first channel of the plurality of channels to a second channel of the plurality of channels adjacent to the first channel, and control the display to display an image corresponding to the second channel;
• in response to determining that the channel change command is the continuous channel change command, control the display to display a channel scroll bar and a channel indicator, the channel scroll bar comprising a plurality of channel points to which the channel indicator is movable, and the channel indicator indicating a position of the current channel among the plurality of channel points included in the channel scroll bar;
• in response to receiving of the continuous channel change command being maintained after the channel scroll bar is displayed, control the channel indicator to move in a first direction or a second direction along the channel scroll bar according to the channel change command and control to maintain the current channel without switching the current channel;
• and
• in response to the channel change command not being received for a predetermined time period while the channel scroll bar is displayed, control to switch the current channel to a channel that corresponds to a point on the channel scroll bar at which the channel indicator is lastly located and display an image that corresponds to the switched channel.