Mobile electronic device capable of switching user interfaces and method thereof

A mobile electronic device capable of switching user interfaces, comprising:

• a storage unit for storing at least one data;
• a display module for selectively displaying a first user interface or a second user interface;
• an audio speaker module for playing sound;
• a sound receiving module for receiving the voice played by the audio speaker module;
• a control unit coupled to the storage unit, the display module and the sound receiving module, the control unit being for generating a signal according to the voice received by the audio speaker module and determining whether the signal matches the at least one data, the control unit being further for controlling the display module to switch from the first user interface to the second user interface when the signal matches the at least one data;
• and
• a proximity sensor coupled to the control unit and for sensing an object, the control unit being further for controlling the display module to switch from the first user interface to the second user interface when the signal matches the at least one data and the proximity sensor does not sense the object.