To provide a cellular phone terminal which allows switching from video phone processing to voice communication processing without spoiling the precedence of video phone processing even in an environment wherein luminance (illuminance) changes in a short time.

A cellular phone includes an execution unit, an acquisition unit, and a comparison unit. The execution unit executes voice communication processing through which a user and an opposite party can have voice communication or video phone processing through which the user and opposite party can have video phone communication. The acquisition unit acquires an illuminance value indicating the lightness of a surrounding environment. The comparison unit compares the illuminance value with a set illuminance value. The execution unit automatically switches the video phone processing to the speech communication processing when the illuminance value is smaller than the set illuminance value in a predetermined period during execution of the video phone processing.