To provide a technology for effectively preventing the nap of a driver while driving.
When it is determined that a portable telephone brought in a vehicle is a portable telephone owned by a personally identified driver (S160: YES), awakening equipment confirms the use history of the alarm function of a portable telephone by referring to a function use history included in information from the portable telephone, and determines whether or not the use history of the alarm function exists (S180). When it is determined that the use history of the alarm function exists, and it is determined that a setting time exists within one hour before and after the current time (S180: YES, S200: YES), alarm sound data which have been used in the setting time are acquired (S210), and it is determined that the acquired alarm sound data are used as an awakening sound.
KIYOHARA HIROBUMI
ENOSAKA TETSUYA
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