A method of controlling a function of a mobile terminal through use of user interaction in the mobile terminal, the method comprising: operating in a vision recognition mode that generates a vision recognition image through use of a signal output from a second plurality of pixels designated as vision pixels from among a first plurality of pixels corresponding to an entire screen of an image sensor included in the mobile terminal when an event occurs in the mobile terminal, wherein the second plurality of pixels are fewer than the first plurality of pixels; determining whether a predetermined object in the vision recognition image corresponds to a person using the second plurality of pixels; the method being characterized in that: when the predetermined object corresponds to the person, determining whether a gesture of the predetermined object corresponds to a gesture of looking at a screen of the mobile terminal using the second plurality of pixels; when the gesture of the predetermined object corresponds to the gesture of looking at the screen: converting the vision recognition mode into an imaging mode that generates a captured image through use of signals output from the first plurality of pixels; performing facial recognition of the predetermined object in the imaging mode; determining whether a result of the facial recognition corresponds to a face of a user who is authorized to use the mobile terminal; and outputting the contents of the event on the screen of the mobile terminal when the result corresponds to the face of the authorized user. operating in a vision recognition mode that generates a vision recognition image through use of a signal output from a second plurality of pixels designated as vision pixels from among a first plurality of pixels corresponding to an entire screen of an image sensor included in the mobile terminal when an event occurs in the mobile terminal, wherein the second plurality of pixels are fewer than the first plurality of pixels; determining whether a predetermined object in the vision recognition image corresponds to a person using the second plurality of pixels; the method being characterized in that: when the predetermined object corresponds to the person, determining whether a gesture of the predetermined object corresponds to a gesture of looking at a screen of the mobile terminal using the second plurality of pixels; when the gesture of the predetermined object corresponds to the gesture of looking at the screen: converting the vision recognition mode into an imaging mode that generates a captured image through use of signals output from the first plurality of pixels; performing facial recognition of the predetermined object in the imaging mode; determining whether a result of the facial recognition corresponds to a face of a user who is authorized to use the mobile terminal; and outputting the contents of the event on the screen of the mobile terminal when the result corresponds to the face of the authorized user. when the predetermined object corresponds to the person, determining whether a gesture of the predetermined object corresponds to a gesture of looking at a screen of the mobile terminal using the second plurality of pixels; when the gesture of the predetermined object corresponds to the gesture of looking at the screen: converting the vision recognition mode into an imaging mode that generates a captured image through use of signals output from the first plurality of pixels; performing facial recognition of the predetermined object in the imaging mode; determining whether a result of the facial recognition corresponds to a face of a user who is authorized to use the mobile terminal; and outputting the contents of the event on the screen of the mobile terminal when the result corresponds to the face of the authorized user. converting the vision recognition mode into an imaging mode that generates a captured image through use of signals output from the first plurality of pixels; performing facial recognition of the predetermined object in the imaging mode; determining whether a result of the facial recognition corresponds to a face of a user who is authorized to use the mobile terminal; and outputting the contents of the event on the screen of the mobile terminal when the result corresponds to the face of the authorized user.