A vehicle-mounted device, comprising: communication means for transmitting and receiving data to and from a center apparatus for distributing content information, via a roadside apparatus; member registration cancellation setting means for setting member registration cancellation information on a distribution service of the content information; writing means for determining whether or not the member registration cancellation information is set, and if the member registration cancellation information is set, writing information indicating member registration cancellation in predetermined items of uplink information to be transmitted to the center apparatus; uplink information transmission means for transmitting the uplink information to the center apparatus by the communication means; current location detection means (1 b) for detecting position information on a current location; parking detection means for detecting parking of a vehicle on which the vehicle-mounted device is mounted; home registration spot storage means for storing home registration spot information; and home registration spot changing means for, when the parking of the vehicle on which the vehicle-mounted device is mounted has been detected by the parking detection, if the number of times in which the position information on the current location detected by the current location detection means and position information indicated by the home registration spot information stored in the home registration spot storage means do not coincide with each other has exceeded a predefined reference number of times, changing the home registration spot information stored in the home registration spot storage means to the position information on the current location, wherein if the home registration spot information stored in the home registration spot storage means has been changed by the home registration spot changing means, the member registration cancellation setting means sets the member registration cancellation information on the distribution service. communication means for transmitting and receiving data to and from a center apparatus for distributing content information, via a roadside apparatus; member registration cancellation setting means for setting member registration cancellation information on a distribution service of the content information; writing means for determining whether or not the member registration cancellation information is set, and if the member registration cancellation information is set, writing information indicating member registration cancellation in predetermined items of uplink information to be transmitted to the center apparatus; uplink information transmission means for transmitting the uplink information to the center apparatus by the communication means; current location detection means (1 b) for detecting position information on a current location; parking detection means for detecting parking of a vehicle on which the vehicle-mounted device is mounted; home registration spot storage means for storing home registration spot information; and home registration spot changing means for, when the parking of the vehicle on which the vehicle-mounted device is mounted has been detected by the parking detection, if the number of times in which the position information on the current location detected by the current location detection means and position information indicated by the home registration spot information stored in the home registration spot storage means do not coincide with each other has exceeded a predefined reference number of times, changing the home registration spot information stored in the home registration spot storage means to the position information on the current location, wherein if the home registration spot information stored in the home registration spot storage means has been changed by the home registration spot changing means, the member registration cancellation setting means sets the member registration cancellation information on the distribution service.