PLAN PREPARATION SYSTEM AND PLAN PREPARATION APPARATUS

A server prepares a charging plan for a travel route to a destination. The server obtains an outside air temperature and a battery temperature. The server reads a map from a storage, and calculates an amount of required heat required for increasing the battery temperature to a target temperature by collating the outside air temperature and the battery temperature with the map. The server prepares the charging plan such that an SOC of a battery at the time of arrival at the destination attains to a prescribed SOC and a sum of an amount of heat generation by charging of the battery at a charging point and an amount of heat generation by charging and discharging of the battery with travel of a vehicle is equal to the amount of required heat.