Antitheft apparatus, antitheft system, antitheft method and program therefor

摘要

A vehicle is equipped with an electronic device having a micro-computer which controls the operations of a playback unit for playing back sound data, and so on. A wireless unit is connected to the micro-computer. When an authentication code from an authentication transceiver is not received by the wireless unit or does not coincide with owner's specific authentication data stored in the electronic device in the condition that the electronic device is made operative by electric power supplied from the vehicle, information indicating occurrence of an abnormality is output.