An on-vehicle information terminal that conducts communication with a road side communication device (base station) located on a road includes a transmitter/receiver section that communicates with the road side communication device, a voice output section that outputs data from the road side communication device which is received by the transmitter/receiver section through a voice or images, and a control section having a priority table that stores information on categories representative of the type of data that is added with the data and transmitted from the road side communication device and priorities for determining orders in which the voice output section outputs the data in association with each other. The priority of the priority table is variable, and is changed on the basis of a signal from a priority setting switch due to the operation of a user or an instruction signal from the road side communication device.