A mobile terminal is provided. The mobile terminal includes a voice receiving module configured to receive the voice of a user through a first application and to generate first voice data for the voice received through the first application, a control module configured to transmit the first voice data and user information corresponding to the first voice data to a service server and to request the service server to register the first voice data and the user information, and a communication module configured to transmit, to the service server, a request for the user information corresponding to the voice of the user received through a second application when the voice of the user is received through the second application.