Abstract: The present invention includes: an identification code generation unit that generates, from information of a company code including a first code that uniquely identifies a management target in a part of a company in the part of the company and a second code that identifies the part of the company, an identification code including a history of the management target; a hash processing unit that hashes the identification code generated by the identification code generation unit according to a hash function and converts the hashed identification code into a meaningless code; and a reference code generation unit that generates a reference code unified for the entire company based on the meaningless code converted by the hash processing unit.

Abstract: An object of the invention is to provide a wireless communication unit capable of suppressing interference of signal resend of one controlled device with reception of a signal transmitted from another controlled device to conduct wireless authentication with two or more controlled devices. In the wireless communication unit of the invention, a short-range wireless control section 162 controls to perform wireless authentication processing with a controlled device 2 using a radio wave at a different frequency depending on whether wireless authentication in an authentication mode with the controlled device 2 results in success or failure.

Abstract: A use limiting system of electronic equipment capable of suppressing power consumption while preventing unauthorized use by other people by limiting the use in the case of theft or loss of electronic equipment is provided. A key 10 and a use limiting apparatus 20 built into a mobile telephone 1 start polling at predetermined polling intervals and also periodically check an operation state of the mobile telephone 1. When the mobile telephone 1 is in operation at that time, the polling interval of the key 10 and the use limiting apparatus 20 is increased from T1 to T2 and when the mobile telephone 1 is not in operation, the elapsed time from the nearest operation time is clocked by a timer and the polling interval is gradually decreased from T1 or T2 to T3-T5 according to the clocked time and the polling is performed.

Abstract: A wireless communication unit capable of suppressing prevention of signal retransmission by one controlled machine against reception of a signal transmitted from another controlled machine when carrying out wireless authentication with a plurality of controlled machines. The wireless communication unit causes a short-range radio control unit (162) to use radio waves of different radio frequencies between a case where the wireless authentication by an authentication mode with a controlled machine (2) is successful and a case where it fails, so as to carry out the wireless authentication with the controlled machine (2).

Abstract: A use limiting system of electronic equipment capable of suppressing power consumption while preventing unauthorized use by other people by limiting the use in the case of theft or loss of electronic equipment is provided. A key 10 and a use limiting apparatus 20 built into a mobile telephone 1 start polling at predetermined polling intervals and also periodically check an operation state of the mobile telephone 1. When the mobile telephone 1 is in operation at that time, the polling interval of the key 10 and the use limiting apparatus 20 is increased from T1 to T2 and when the mobile telephone 1 is not in operation, the elapsed time from the nearest operation time is clocked by a timer and the polling interval is gradually decreased from T1 or T2 to T3-T5 according to the clocked time and the polling is performed.