A mobile terminal includes a communication unit, a microphone, a display, and a controller to transmit a request for transmitting diagnostic data to a home appliance through the communication unit, to extract diagnostic data of the home appliance from sound received from the home appliance through the microphone, and to transmit a diagnostic data image, acquired by imaging the diagnostic data, to a server. Thereby, the mobile terminal may conveniently transmit the diagnostic data image based on the diagnostic data of the home appliance to the server.