An information processing device is an information processing device (a DCM or a processing device) that is provided in a vehicle mounted with communication equipment or is provided in an external device (a center server) configured to perform communication with the communication equipment, and includes a storage unit configured to store association information in which equipment identification information unique to a DCM and vehicle identification information unique to an authorized vehicle mounted with the DCM are associated. With this configuration, it is possible to determine whether or not the DCM is mounted in an authorized vehicle using the stored association information, for example, by comparing the vehicle identification information of the authorized vehicle associated with the equipment identification information unique to the DCM with received vehicle identification information. For this reason, it is possible to specify the authorized vehicle mounted with the DCM.