Device and method for controlling sound output

A device and method for controlling a sound output. The device includes a sound output unit configured to output sound of content; a display unit configured to display a plurality of windows; and a control unit configured to, when a user input signal that selects one of the plurality of windows is received, output sound of content being reproduced on the selected window through the sound output unit and discontinue outputting sound of content being reproduced on the plurality of windows, except for the selected window. 种用于控制声音输出的装置和方法。所述装置包括：声音输出器，被配置为输出内容的声音；显示器，被配置为显示多个窗口；控制器，被配置为响应于接收到指示对所述多个窗口中的个窗口的选择的用户输入信号，通过声音输出器输出在选择的窗口中正在再现的内容的声音，并停止输出在所述多个窗口中的除了选择的窗口之外的窗口中正在再现的内容的声音。