The invention discloses a mobile communication terminal having security text output function and a text output method thereof, the mobile communication terminal belongs to a mobile communication technology. The mobile communication terminal of the invention includes following sections: a key input unit for outputting a key-press signal; a control unit for outputting other key value different to the pressed key in a display unit when a security function is set. The text output method outputs other key value different to the input key in the display unit when the security function is set, so as to enabel other person can't distinguish the inputted content. When an user don't expect the own inputted information is leaked to others, other key value different to the input key in the display unit can be inputted by setting a security function, thereby other person can't distinguish the inputted information. |