A roadside radio device comprising: a first radio unit (320; 320b) configured to receive a radio data packet from an in-vehicle radio device; and a first application unit configured to receive application data included in the radio data packet, wherein the radio data packet includes vehicle identification information given by a second radio unit (220; 220a; 220b) of the in-vehicle radio device, and communication type information given by a second application unit of the in-vehicle radio device, wherein the vehicle identification information comprises information indicating a vehicle in which the in-vehicle radio device is mounted, wherein the communication type information comprises information indicating a vehicle to which the application data relates, wherein the vehicle identification information and the communication type information are indicated using vehicle class information identifying a type of vehicles, wherein the first radio unit (320; 320b) comprises a first Secure Application Module configured to include the vehicle identification information in the application data to output the application data to the first application unit, wherein the first application unit comprises a vehicle class information comparison unit configured to compare the vehicle identification information with the communication type information, wherein, when the vehicle class information comparison unit determines that the vehicle identification information and the communication type information matches, the first application unit is configured to process the application data received from the first radio unit (320; 320b), and wherein, when the vehicle class information comparison unit determines that the vehicle identification information and the communication type information do not match, the first application unit is configured to treat, as invalid data, the application data received from the first radio unit (320; 320b), characterized in that the first radio unit (320; 320b) further comprises a first frequency channel allocation control unit (360; 360a; 360b) configured, when the first radio unit (320; 320b) receives a frequency channel request signal for requesting allocation of a frequency channel for radio communication from the in-vehicle radio device, to determine whether to allocate the frequency channel to the in-vehicle radio device based on whether information identifying the in-vehicle radio device is registered in the first radio unit (320; 320b) as information of a spoofing radio device. a first radio unit (320; 320b) configured to receive a radio data packet from an in-vehicle radio device; and a first application unit configured to receive application data included in the radio data packet, wherein the radio data packet includes vehicle identification information given by a second radio unit (220; 220a; 220b) of the in-vehicle radio device, and communication type information given by a second application unit of the in-vehicle radio device, wherein the vehicle identification information comprises information indicating a vehicle in which the in-vehicle radio device is mounted, wherein the communication type information comprises information indicating a vehicle to which the application data relates, wherein the vehicle identification information and the communication type information are indicated using vehicle class information identifying a type of vehicles, wherein the first radio unit (320; 320b) comprises a first Secure Application Module configured to include the vehicle identification information in the application data to output the application data to the first application unit, wherein the first application unit comprises a vehicle class information comparison unit configured to compare the vehicle identification information with the communication type information, wherein, when the vehicle class information comparison unit determines that the vehicle identification information and the communication type information matches, the first application unit is configured to process the application data received from the first radio unit (320; 320b), and wherein, when the vehicle class information comparison unit determines that the vehicle identification information and the communication type information do not match, the first application unit is configured to treat, as invalid data, the application data received from the first radio unit (320; 320b), characterized in that the first radio unit (320; 320b) further comprises a first frequency channel allocation control unit (360; 360a; 360b) configured, when the first radio unit (320; 320b) receives a frequency channel request signal for requesting allocation of a frequency channel for radio communication from the in-vehicle radio device, to determine whether to allocate the frequency channel to the in-vehicle radio device based on whether information identifying the in-vehicle radio device is registered in the first radio unit (320; 320b) as information of a spoofing radio device.