Method of controlling mobile terminal

A mobile terminal comprising:

• a display to display a diagnosis mode on the display so as to allow a user to select whether information about a current state of the home appliance or presence of a problem is received as an audio signal or as a digital signal, the information being diagnosed by the home appliance;
• a first communication module to communicate with a second communication module provided at the home appliance and with an external server;
• a microphone to correspond with a speaker of the home appliance;
• a memory to store application programs including an application for diagnosis of the home appliance;
• and
• a controller connected to the display, the first communication module, the microphone and the memory,
• wherein the controller controls the display such that the display displays a diagnosis result of the home appliance and a solution based on the diagnosis result to suggest a measure to be taken on the display when the diagnosis mode is selected and the information as the audio signal or as the digital signal according to the diagnosis mode is received from the home appliance,
• wherein the diagnosis mode comprises an audio diagnosis mode in which the information is received as an audio signal through the microphone, and in the audio diagnosis mode, the controller controls the display such that the display displays whether an intensity of the audio signal is within an appropriate band, and
• wherein in the audio diagnosis mode, the controller controls the display such that the display visually displays a guide line as a reference of the appropriate band and an amplitude of the audio signal on the guide line.