1. A communication device, which is a handheld device, comprising: a microphone; a speaker; an input device; a display; an antenna; a voice communicating implementer, wherein voice communication is implemented by sending and receiving audio data via said antenna; a downloaded video game implementer, wherein a video game software which is downloaded from a host computer is executed; an auto time adjusting implementer, wherein the clock of said communication device is automatically adjusted by referring to a certain data received via said antenna; a moving picture replaying implementer, wherein a moving picture stored in said communication device is replayed; a calculating implementer, wherein a mathematical calculation is implemented by utilizing numeric data input via said input device; a bold font displaying implementer, wherein a certain portion of alphanumeric data is displayed with bold font; a stereo audio data output implementer, wherein stereo audio data stored in said communication device is processed to be output in a stereo fashion; a photo quality setting implementer, wherein a photo is stored in said communication device with the user identified quality; a multiple language implementer, wherein a list of multiple languages is displayed from which the user is operable to select a certain language, and the user interface of said communication device is displayed with the selected certain language; and a caller's information displaying implementer, wherein upon receiving a phone call, a caller's information which indicates the phone number and/or name of the caller is displayed.