Provided is a system or the like which is able to achieve suitable improvement of usability of information provided to the driver of each vehicle in view of the environment in which the vehicle is travelling. The system or the like enables to make the driver of each vehicle aware of reference driving information according to a driving index value of a reference vehicle which is extracted based on a standard value from a plurality of vehicles. It is thus possible to make the driver aware of a correlation between the standard value and the reference driving index value, and use it as reference when driving the vehicle himself/herself. The standard value is set fluidly according to the actual fuel consumption or electric power consumption of each vehicle.