6. The input method of claim 1 , wherein the facial expression code comprises a coordinate value of each facial expression characteristic point in the facial expression image, and the coordinate value is in a Cartesian coordinate system and calculated by the facial expression analyzing unit.
1. An input method applicable for inputting into an electronic device having an image capturing unit, a processing module, a lip-reading analyzing unit, a lip motion code database, a display module, a facial expression analyzing unit and a facial expression code database, and the input method comprising the steps of: capturing a lip motion of a person through the image capturing unit; receiving an image of the lip motion from the image capturing unit; encoding the lip motion image through the lip-reading analyzing unit to obtain a lip motion code; the processing module comparing the lip motion code with a plurality of standard lip motion codes stored in the lip motion code database, to obtain a first text result matching the lip motion code; displaying the first text result through the display module if the first text result is obtained; activating an auxiliary analyzing mode, if the first text result is not obtained, wherein the auxiliary analyzing mode is a facial expression analyzing mode; capturing a facial expression of the person through the image capturing unit; receiving an image of the facial expression from the image capturing unit; encoding the facial expression image through the facial expression analyzing unit to obtain a facial expression code; the processing module comparing the facial expression code with a plurality of standard facial expression codes stored in the facial expression code database, and comparing the lip motion code with the plurality of standard lip motion codes, to obtain a second text result matching the facial expression code and the lip motion code; and displaying the second text result through the display module if the second text result is obtained.