Patent ID: 7436798

Claim:
A communication system in which a communication terminal apparatus and a wireless key apparatus are provided and a wireless communication is possible by a predetermined wireless communication system which has a first communication mode attempting at least a wireless connection by a first period for carrying out a wireless connection between said communication terminal apparatus and said wireless key apparatus and a second communication mode carrying out a wireless communication between said communication terminal apparatus and said wireless key apparatus by a second period longer than that in said connection mode in a case when said wireless connection is executed, wherein said communication terminal apparatus comprises: first communication means for carrying out a wireless communication with said wireless key apparatus by said predetermined wireless communication system; mode setting means for setting a normal mode which makes a predetermined function of said communication terminal apparatus operable and a function limitation mode which limits the operation of said predetermined function; and first control means for controlling said mode setting means so as to be set in a normal mode in a case when said first communication means communicates with said wireless key apparatus by being set in said second communication mode and for controlling said mode setting means so as to be set in a function limitation mode in a case when said first communication means communicates with said wireless key apparatus by being set in said first communication mode, and said wireless key apparatus comprises: second communication means for carrying out a wireless communication with said communication terminal apparatus by said predetermined wireless communication system; first warning means for carrying out a predetermined warning operation; and second control means for controlling said warning means so as to execute a warning operation in a case when said second communication means is setting-changed from said second communication mode to said first communication mode.