1. A mobile communication device which allows handwriting to input at least one symbol to execute a preset corresponding operating instruction, comprising: a touch panel for handwriting to input the symbols and for displaying an operating interface of the mobile communication device; a memory, including: an image database for storing the symbols; an instruction database for storing the operating instructions which correspond to the symbols; and at least one software; a micro processor for analyzing the symbols based on the image database, retrieving the corresponding operating instruction from the instruction database according to the analysis result, executing the corresponding software based on the operating instruction and when the analysis of the symbols or retrieving the symbols and corresponding operating instruction fails, letting a user set up the operating instruction and the software which correspond to the symbols by the operating interface; wherein the micro processor selects setting up with the symbol or reentering the symbol, selects the corresponding software from a software list, produces an operating instruction list based on the selected software, and selects the operating instruction to correspond to the symbol, for letting the user set up the operating instruction and the software which correspond to the symbols by the operating interface; a communication module, connecting to the micro processor for executing a voice communication; and a message module, connecting to the micro processor for sending a message.