A method of controlling a mobile terminal, for diagnosing a home appliance using the mobile terminal is disclosed. The method includes a menu display step of displaying a diagnosis menu for diagnosis of a home appliance on a display, an information receiving step of receiving information about a current state of the home appliance or presence of a problem as an audio signal when the diagnosis menu is selected, the information being diagnosed by the home appliance, a result display step of displaying a diagnosis result of the home appliance on the display, the diagnosis result being obtained based on the information received in the information receiving step, and a solution display step of displaying a solution based on the diagnosis result to suggest a measure to be taken by a user to the user.