A display apparatus comprising: a display; a voice input receiver; a memory storing at least one instruction; and a processor which when executing the at least one instruction is configured to control to: perform a user account authentication of a user of the display apparatus; based on a user input for user voice registration of the user being received, obtain information on a surrounding environment of the display apparatus and information on the user; obtain an utterance sentence, for guiding a voice input to register voice of the authenticated user, based on the information on the surrounding environment of the display apparatus and the information on the user; control the display to display the utterance sentence; based on an utterance voice of the user corresponding to the utterance sentence being received through the voice input receiver, obtain voice information of the user based on the utterance voice of the user; and store, by matching the voice information to the authenticated user account of the user, the voice information in the memory, wherein the information on the surrounding environment includes at least one of country in which the display apparatus is located, location the display apparatus is disposed or environmental information of space in which the display apparatus is disposed, wherein the environmental information includes at least one of illuminance, temperature, humidity, or color temperature of the space, and wherein the information on the user includes at least one of preferred applications, preferred content or nationality of the authenticated user. a display; a voice input receiver; a memory storing at least one instruction; and a processor which when executing the at least one instruction is configured to control to: perform a user account authentication of a user of the display apparatus; based on a user input for user voice registration of the user being received, obtain information on a surrounding environment of the display apparatus and information on the user; obtain an utterance sentence, for guiding a voice input to register voice of the authenticated user, based on the information on the surrounding environment of the display apparatus and the information on the user; control the display to display the utterance sentence; based on an utterance voice of the user corresponding to the utterance sentence being received through the voice input receiver, obtain voice information of the user based on the utterance voice of the user; and store, by matching the voice information to the authenticated user account of the user, the voice information in the memory, wherein the information on the surrounding environment includes at least one of country in which the display apparatus is located, location the display apparatus is disposed or environmental information of space in which the display apparatus is disposed, wherein the environmental information includes at least one of illuminance, temperature, humidity, or color temperature of the space, and wherein the information on the user includes at least one of preferred applications, preferred content or nationality of the authenticated user. perform a user account authentication of a user of the display apparatus; based on a user input for user voice registration of the user being received, obtain information on a surrounding environment of the display apparatus and information on the user; obtain an utterance sentence, for guiding a voice input to register voice of the authenticated user, based on the information on the surrounding environment of the display apparatus and the information on the user; control the display to display the utterance sentence; based on an utterance voice of the user corresponding to the utterance sentence being received through the voice input receiver, obtain voice information of the user based on the utterance voice of the user; and store, by matching the voice information to the authenticated user account of the user, the voice information in the memory, wherein the information on the surrounding environment includes at least one of country in which the display apparatus is located, location the display apparatus is disposed or environmental information of space in which the display apparatus is disposed, wherein the environmental information includes at least one of illuminance, temperature, humidity, or color temperature of the space, and wherein the information on the user includes at least one of preferred applications, preferred content or nationality of the authenticated user.