1. A wireless communication device comprising an input device, a microphone, a speaker, a camera, a video image generator, and a display; wherein said wireless communication device implements a 1st function, a 2nd function, and a 3rd function; wherein said video image generator processes images retrieved from said camera and said images are displayed on said display under said 1st function; wherein said video image generator generates three-dimensional images and said three-dimensional images are displayed on said display under said 2nd function, wherein said three-dimensional images are computer-generated 3D graphics of which the perspective views displayed on said display are changed in accordance with the current location of said wireless communication device; and wherein said video image generator processes wireless incoming images and said wireless incoming images are displayed on said display under said 3rd function, wherein said wireless incoming images are the images received in wireless manner.