Method and electronic device for authenticating user by using voice command

An electronic device comprising:

• a memory;
• an input device;
• and
• a processor,
• wherein the processor is configured to:
• receive a voice command of a first user from the input device;
• acquire an identifier indicating the first user and voice print information of the first user from the received voice command;
• search a first reference voice print information including the identifier of the first user from among a plurality of pieces of reference voice print information stored in the memory, wherein the plurality of pieces of reference voice information include identifiers of a plurality of users including the first user, and are generated by the first user;
• perform authentication on the basis of a comparison between the acquired voice print information and the first reference voice print information;
• based on the authentication failing, retrieve second reference voice print information from among the plurality of pieces of reference voice print information, wherein the second reference voice print information includes another identifier indicating a second user and is generated by the first user;
• and
• perform authentication of the first user based on a comparison between the acquired voice print information and the second reference voice print information,
• wherein the second reference voice print information is acquired from a previous voice command of the first user received in a state of successful authentication and stored in the memory.