Patent ID: 7340215

Claim:
A communication system which includes a communication terminal apparatus and a wireless key apparatus capable of a wireless communication with the communication terminal apparatus by a predetermined wireless communication system and limits a function of said communication terminal apparatus in response to a communication state between said communication terminal apparatus and said wireless key apparatus, wherein said wireless key apparatus comprises: a communication circuit for carrying out a wireless communication by said predetermined wireless communication system; and a control unit for controlling so as to make a communication connection with said communication terminal apparatus in said communication means; said communication terminal apparatus comprises; a communication circuit for carrying out a wireless communication by said predetermined wireless communication system, and a control unit for controlling a communication state in said communication circuit and for limiting a function of said terminal apparatus when a predetermined communication state with said wireless key apparatus cannot be maintained and for not limiting the function of said terminal apparatus regardless of the communication state with said wireless key apparatus when said communication terminal apparatus detects is a predetermined region, wherein the control unit of said communication terminal apparatus terminates the wireless connection with said wireless key apparatus in said communication circuit when it is detected that said communication terminal apparatus is in a predetermined region.