An electronic apparatus comprising: a communication interface; and at least one processor configured to: receive a first audio signal and a second audio signal from a first sensor device and a second sensor device located away from the first sensor device, respectively, through the communication interface, the first audio signal and the second audio signal comprising a trigger signal, acquire similarity between the first audio signal and the second audio signal by determining whether the first audio signal and the second audio signal result from the same utterance, acquire a first quality characteristic of the first audio signal based on an operation state of an electronic apparatus located adjacent to the first sensor device, and a second quality characteristic of the second audio signal based on an operation state of an electronic apparatus located adjacent to the second sensor device in a case in which the similarity is equal to or higher than a threshold value, identify one of the first sensor device or the second sensor device as an effective sensor device based on the first quality characteristic and the second quality characteristic, and perform speech recognition with respect to an additional audio signal received from the effective sensor device after receiving the first audio signal and the second audio signal. a communication interface; and at least one processor configured to: receive a first audio signal and a second audio signal from a first sensor device and a second sensor device located away from the first sensor device, respectively, through the communication interface, the first audio signal and the second audio signal comprising a trigger signal, acquire similarity between the first audio signal and the second audio signal by determining whether the first audio signal and the second audio signal result from the same utterance, acquire a first quality characteristic of the first audio signal based on an operation state of an electronic apparatus located adjacent to the first sensor device, and a second quality characteristic of the second audio signal based on an operation state of an electronic apparatus located adjacent to the second sensor device in a case in which the similarity is equal to or higher than a threshold value, identify one of the first sensor device or the second sensor device as an effective sensor device based on the first quality characteristic and the second quality characteristic, and perform speech recognition with respect to an additional audio signal received from the effective sensor device after receiving the first audio signal and the second audio signal. receive a first audio signal and a second audio signal from a first sensor device and a second sensor device located away from the first sensor device, respectively, through the communication interface, the first audio signal and the second audio signal comprising a trigger signal, acquire similarity between the first audio signal and the second audio signal by determining whether the first audio signal and the second audio signal result from the same utterance, acquire a first quality characteristic of the first audio signal based on an operation state of an electronic apparatus located adjacent to the first sensor device, and a second quality characteristic of the second audio signal based on an operation state of an electronic apparatus located adjacent to the second sensor device in a case in which the similarity is equal to or higher than a threshold value, identify one of the first sensor device or the second sensor device as an effective sensor device based on the first quality characteristic and the second quality characteristic, and perform speech recognition with respect to an additional audio signal received from the effective sensor device after receiving the first audio signal and the second audio signal.