Patent ID: 8376216

Claim:
A reader device which is carried by a user and includes a carrier identification information reader unit for reading carrier identification information from a data carrier for identifying the data carrier, which is in a non-contact state from the carrier identification information reader unit, comprising: a reading time counting unit for counting a number of times that carrier identification information is read by the carrier identification information reader unit; a user correlation unit for selecting at least one carrier identification information from carrier identification information read by the carrier identification information reader unit, according to the number of times counted by the reading time counting unit, and for correlating the selected carrier identification information with the user; a home correlation unit that correlates carrier identification information read by the carrier identification information reader unit with a home of the user based on whether the carrier identification information is read from a data carrier identified as a fixed data carrier and based on the number of times counted by the reading time counting unit, wherein the reader unit judges that the user is not out when the carrier identification information correlated with the home of the user is acquired; a reader position acquisition unit that acquires a change of position of the user; and an aboard judgment unit that judges whether a user is in a vehicle based on the change of position of the user acquired by the reader position acquisition unit and based on whether carrier identification information is read from a data carrier identified as a moving data carrier.