A first server apparatus is communicably connected to each of a second server apparatus having a server-less function and a vehicle and includes an obtaining unit obtaining, from the vehicle, start position information indicating a start position of the vehicle, start date-and-time information indicating a start date and time of the vehicle, parking position information indicating a parking position of the vehicle, and parking date-and-time information indicating a parking date and time of the vehicle, an estimating unit estimating a date and time at which the vehicle is started based on the start position, the start date and time, the parking position and the parking date and time, and an instructing unit instructing the second server apparatus to activate a personal authentication program in accordance with an estimation result by the estimating unit.