An electronic device comprising: a memory; a sound sensor; and a processor configured to: receive, from the sound sensor, sound data comprising a first piece of data corresponding to a first frequency band and a second piece of data corresponding to a second frequency band different from the first frequency band; receive voice data related to a voice of a registered user from the memory; perform voice identification by comparing the first piece of data and the second piece of data with the voice data related to the voice of the registered user in each relevant frequency band; and determine an output based on a result of the voice identification, wherein the sound sensor comprises a plurality of mechanical oscillators configured to sense the sound data according to frequency bands, wherein the plurality of mechanical oscillators comprise: two or more first mechanical oscillators configured to sense the sound data in a first band; and two or more second mechanical oscillators configured to sense the sound data in a second band; wherein the processor is further configured to perform the voice identification by: determining whether to accept or reject the first piece of data based on the similarity between the first piece of data and the voice data related to the voice of the registered user in the first frequency band, and determining whether to accept or reject the second piece of data based on the similarity between the second piece of data and the voice data related to the voice of the registered user in the second frequency band, wherein the processor is further configured to determine the output based on the result of the voice identification by: determining final voice identification is successful if the number of accepted pieces of data is greater than the number of rejected pieces of data. a memory; a sound sensor; and a processor configured to: receive, from the sound sensor, sound data comprising a first piece of data corresponding to a first frequency band and a second piece of data corresponding to a second frequency band different from the first frequency band; receive voice data related to a voice of a registered user from the memory; perform voice identification by comparing the first piece of data and the second piece of data with the voice data related to the voice of the registered user in each relevant frequency band; and determine an output based on a result of the voice identification, receive, from the sound sensor, sound data comprising a first piece of data corresponding to a first frequency band and a second piece of data corresponding to a second frequency band different from the first frequency band; receive voice data related to a voice of a registered user from the memory; perform voice identification by comparing the first piece of data and the second piece of data with the voice data related to the voice of the registered user in each relevant frequency band; and determine an output based on a result of the voice identification, wherein the sound sensor comprises a plurality of mechanical oscillators configured to sense the sound data according to frequency bands, wherein the plurality of mechanical oscillators comprise: two or more first mechanical oscillators configured to sense the sound data in a first band; and two or more second mechanical oscillators configured to sense the sound data in a second band; two or more first mechanical oscillators configured to sense the sound data in a first band; and two or more second mechanical oscillators configured to sense the sound data in a second band; wherein the processor is further configured to perform the voice identification by: determining whether to accept or reject the first piece of data based on the similarity between the first piece of data and the voice data related to the voice of the registered user in the first frequency band, and determining whether to accept or reject the second piece of data based on the similarity between the second piece of data and the voice data related to the voice of the registered user in the second frequency band, wherein the processor is further configured to determine the output based on the result of the voice identification by: determining final voice identification is successful if the number of accepted pieces of data is greater than the number of rejected pieces of data. determining whether to accept or reject the first piece of data based on the similarity between the first piece of data and the voice data related to the voice of the registered user in the first frequency band, and determining whether to accept or reject the second piece of data based on the similarity between the second piece of data and the voice data related to the voice of the registered user in the second frequency band, wherein the processor is further configured to determine the output based on the result of the voice identification by: determining final voice identification is successful if the number of accepted pieces of data is greater than the number of rejected pieces of data.