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 unit that detects an acceleration/deceleration change of the vehicle equipped with the on-vehicle device and a transmission unit that transmits acceleration/deceleration information pertaining to the detected acceleration/deceleration change. The server device includes a reception unit that receives the acceleration/deceleration information, a statistical parameter calculating unit that calculates 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 unit for estimating the extent of energy consumption or energy regeneration based upon the calculated statistical parameters.