An on-vehicle device mountable on a vehicle in use, wherein the on-vehicle device is connectable with a terminal device adapted to receive notification information for notifying predetermined information, is configured to communicate with an information processing device directly or via the terminal device, is provided with a head-up display as a display device that allows a driver of the vehicle to visually recognize display of displayed information, is provided with a pressure sensor and a camera, and comprises a display panel as a display device that allows the driver and a passenger of the vehicle other than the driver to visually recognize display of displayed information, characterized in that the on-vehicle device is configured to generate passenger information indicating any one of a state where a passenger other than the driver exists in the vehicle, a state where no passenger other than the driver exists in the vehicle, or a state where a passenger other than the driver is sleeping in the vehicle based on a signal from the pressure sensor and an image from the camera, is configured to transmit the passenger information to the information processing device, is configured to receive the notification information from the terminal device, is configured to receive display location information from the terminal device or the information processing device, wherein the display location information is information indicating the display device (4, 33a) displaying information based on the notification information, the display location information is determined by the information processing device based on the passenger information received from the terminal device and notification related information indicating a type of the notification information, and the notification related information is generated from the notification information by the terminal device, and is configured to display information based on the notification information on the display device (4, 33a) indicated by the display location information which is received. the on-vehicle device is connectable with a terminal device adapted to receive notification information for notifying predetermined information, is configured to communicate with an information processing device directly or via the terminal device, is provided with a head-up display as a display device that allows a driver of the vehicle to visually recognize display of displayed information, is provided with a pressure sensor and a camera, and comprises a display panel as a display device that allows the driver and a passenger of the vehicle other than the driver to visually recognize display of displayed information, characterized in that the on-vehicle device is configured to generate passenger information indicating any one of a state where a passenger other than the driver exists in the vehicle, a state where no passenger other than the driver exists in the vehicle, or a state where a passenger other than the driver is sleeping in the vehicle based on a signal from the pressure sensor and an image from the camera, is configured to transmit the passenger information to the information processing device, is configured to receive the notification information from the terminal device, is configured to receive display location information from the terminal device or the information processing device, wherein a state where a passenger other than the driver exists in the vehicle, a state where no passenger other than the driver exists in the vehicle, or a state where a passenger other than the driver is sleeping in the vehicle based on a signal from the pressure sensor and an image from the camera, is configured to transmit the passenger information to the information processing device, is configured to receive the notification information from the terminal device, is configured to receive display location information from the terminal device or the information processing device, wherein the display location information is information indicating the display device (4, 33a) displaying information based on the notification information, the display location information is determined by the information processing device based on the passenger information received from the terminal device and notification related information indicating a type of the notification information, and the notification related information is generated from the notification information by the terminal device, and is configured to display information based on the notification information on the display device (4, 33a) indicated by the display location information which is received.