Information system for automotive, on-vehicle and server device

An information system for automotive includes a plurality of on-vehicle devices each installed in a vehicle and a server device connected with the on-vehicle devices via a communication network. The plurality of on-vehicle devices each include an acceleration/deceleration change detection means for detecting an acceleration/deceleration change of the vehicle equipped with the on-vehicle device and a transmission means for transmitting acceleration/deceleration information pertaining to the detected acceleration/deceleration change. The server device includes a reception means for receiving the acceleration/deceleration information, a statistical parameter calculating means for calculating statistical parameters to be used to estimate an extent of energy consumption or energy regeneration based upon the received acceleration/deceleration information, and an estimating means for estimating the extent of energy consumption or energy regeneration based upon the calculated statistical parameters.