An audio output system comprising: a plurality of speaker devices (100-1, 100-2, 100-3, 100-4 and 100-5) connected to a network, each comprising: a storage configured to store at least one parameter which affects a volume characteristic of the speaker device; an audio output unit configured to output audio based on the volume characteristic of the speaker device; a communicator configured to communicate with other speaker devices of the plurality of speaker devices, and a processor configured to control the communicator to share device information with each of the other speaker devices of the plurality of speaker devices in response to the plurality of speaker devices being grouped by a user selection to operate together, and wherein the audio output system is configured to identify a host speaker device from the plurality of speaker devices which satisfies a predetermined condition based on the shared device information, wherein the processor of the identified host speaker device is configured to control the communicator of the host speaker device to transmit the least one parameter stored in the host speaker device to the other speaker devices of the plurality of speaker devices, and wherein the processor of each of the other speaker devices of the plurality of speaker devices is configured to calibrate the volume characteristic of said speaker device based on a comparison between the at least one parameter received from the host speaker device and the at least one parameter stored in the storage of said speaker device so that the volume characteristic of said speaker device is consistent with the volume characteristic of the host speaker device. a plurality of speaker devices (100-1, 100-2, 100-3, 100-4 and 100-5) connected to a network, each comprising: a storage configured to store at least one parameter which affects a volume characteristic of the speaker device; an audio output unit configured to output audio based on the volume characteristic of the speaker device; a communicator configured to communicate with other speaker devices of the plurality of speaker devices, and a processor configured to control the communicator to share device information with each of the other speaker devices of the plurality of speaker devices in response to the plurality of speaker devices being grouped by a user selection to operate together, and a storage configured to store at least one parameter which affects a volume characteristic of the speaker device; an audio output unit configured to output audio based on the volume characteristic of the speaker device; a communicator configured to communicate with other speaker devices of the plurality of speaker devices, and a processor configured to control the communicator to share device information with each of the other speaker devices of the plurality of speaker devices in response to the plurality of speaker devices being grouped by a user selection to operate together, and wherein the audio output system is configured to identify a host speaker device from the plurality of speaker devices which satisfies a predetermined condition based on the shared device information, wherein the processor of the identified host speaker device is configured to control the communicator of the host speaker device to transmit the least one parameter stored in the host speaker device to the other speaker devices of the plurality of speaker devices, and wherein the processor of each of the other speaker devices of the plurality of speaker devices is configured to calibrate the volume characteristic of said speaker device based on a comparison between the at least one parameter received from the host speaker device and the at least one parameter stored in the storage of said speaker device so that the volume characteristic of said speaker device is consistent with the volume characteristic of the host speaker device. <EOS>