A sound output control system comprising: an electronic device connectable to a speaker; at least one voice recognition device (20, 21, 22), each comprising voice recognition circuitry configured to receive a voice command from a user; and a server configured to be informed by a voice recognition device (20, 21, 22) whenever said voice recognition device (20, 21, 22) receives a voice command and to transmit identification information of said voice recognition device (20, 21, 22) to the electronic device, the electronic device comprising: a communication device comprising communication circuitry; a storage device comprising a memory; and a controller, wherein the communication circuitry is configured to detect a voice recognition device (20, 21, 22) within a specified distance of the electronic device and receive first identification information for the detected voice recognition device (20, 21, 22) from the detected voice recognition device (20, 21, 22), wherein the memory is configured to store the received first identification information of the detected voice recognition device (20, 21, 22); and wherein the controller, while controlling the electronic device to output sound, is configured to: based on a voice command from a user being received through a voice recognition device (20, 21, 22), control the communication device to receive, from the server, second identification information of the voice recognition device that has received the voice command; compare the received second identification information with the first identification information stored in the storage device; and control, based on the received second identification information being identical to the stored first identification information, the electronic device to stop outputting the sound or reduce the volume of the sound being output by the speaker. an electronic device connectable to a speaker; at least one voice recognition device (20, 21, 22), each comprising voice recognition circuitry configured to receive a voice command from a user; and a server configured to be informed by a voice recognition device (20, 21, 22) whenever said voice recognition device (20, 21, 22) receives a voice command and to transmit identification information of said voice recognition device (20, 21, 22) to the electronic device, the electronic device comprising: a communication device comprising communication circuitry; a storage device comprising a memory; and a controller, wherein the communication circuitry is configured to detect a voice recognition device (20, 21, 22) within a specified distance of the electronic device and receive first identification information for the detected voice recognition device (20, 21, 22) from the detected voice recognition device (20, 21, 22), wherein the memory is configured to store the received first identification information of the detected voice recognition device (20, 21, 22); and wherein the controller, while controlling the electronic device to output sound, is configured to: based on a voice command from a user being received through a voice recognition device (20, 21, 22), control the communication device to receive, from the server, second identification information of the voice recognition device that has received the voice command; compare the received second identification information with the first identification information stored in the storage device; and control, based on the received second identification information being identical to the stored first identification information, the electronic device to stop outputting the sound or reduce the volume of the sound being output by the speaker. a communication device comprising communication circuitry; a storage device comprising a memory; and a controller, wherein the communication circuitry is configured to detect a voice recognition device (20, 21, 22) within a specified distance of the electronic device and receive first identification information for the detected voice recognition device (20, 21, 22) from the detected voice recognition device (20, 21, 22), wherein the memory is configured to store the received first identification information of the detected voice recognition device (20, 21, 22); and wherein the controller, while controlling the electronic device to output sound, is configured to: based on a voice command from a user being received through a voice recognition device (20, 21, 22), control the communication device to receive, from the server, second identification information of the voice recognition device that has received the voice command; compare the received second identification information with the first identification information stored in the storage device; and control, based on the received second identification information being identical to the stored first identification information, the electronic device to stop outputting the sound or reduce the volume of the sound being output by the speaker. based on a voice command from a user being received through a voice recognition device (20, 21, 22), control the communication device to receive, from the server, second identification information of the voice recognition device that has received the voice command; compare the received second identification information with the first identification information stored in the storage device; and control, based on the received second identification information being identical to the stored first identification information, the electronic device to stop outputting the sound or reduce the volume of the sound being output by the speaker.