Electronic apparatus and method for controlling sound of electronic apparatus

An electronic apparatus comprising:

• a receiver;
• a display configured to display content;
• a speaker configured to output sound;
• a communicator configured to receive information from an external remote control device;
• and
• a processor configured to:
• control the receiver to receive a first content and a first sound corresponding to the first content from a first broadcast channel,
• control the display to display the first content on an entire screen of the display and the speaker to output the first sound,
• based on receiving, through the communicator, first control information from the external remote control device while the first content is displayed and the first sound is output, control the receiver to receive a second content and a second sound corresponding to the second content from a second broadcast channel while maintaining receiving the first content and the first sound from the first broadcast channel, the first control information comprising a combinational control command input through a channel changing button and a volume removal button that are included in the external remote control device to (a) change a display of the first content of the first broadcast channel to a display of the second content of the second broadcast channel and (b) continue outputting the first sound corresponding to the first broadcast channel, and
• based on the combinational control command, control the display to display the second content on the entire screen of the display, in place of displaying the first content, and control the speaker to output the first sound without outputting the second sound.