A vehicle management system configured to manage a plurality of vehicles used at an office comprising a power generation apparatus, wherein each of the plurality of vehicles includes a battery, the vehicle management system includes: a first prediction control unit configured to cause a prediction for an amount of surplus power defined as a difference between the power generated at the office by the power generation apparatus and the amount of power consumed by the office on a non-work day of the office; and a second prediction control unit configured to cause a prediction for a power capacity that can be accumulated by the each of the plurality of vehicles at the office on the non-work day; characterized in that the vehicle management system includes a selection control unit configured to cause a to-be-retained vehicle to be retained at the office and connected to the power generation apparatus of the office on the non-work day to be selected from among the plurality of vehicles on a basis of the amount of surplus power generated at the office on the non-work day and the power capacity that can be accumulated by the each of the plurality of vehicles at the office on the non-work day, and a charge/discharge control unit configured to cause an amount of charging/discharging of the to-be-retained vehicle on a work day of the office to be adjusted such that a remaining capacity of a battery included in the to-be-retained vehicle becomes equal to or less than a predetermined value before the non-work day, wherein when the remaining capacity of the battery included in the to-be-retained vehicle on the work day of the office becomes higher than the predetermined value, the selection control unit is configured to cause another vehicle, which includes a battery having a remaining capacity lower than the predetermined value, to be selected from among the plurality of vehicles as a new to-be-retained vehicle to be retained at the office on the non-work day. each of the plurality of vehicles includes a battery, the vehicle management system includes: a first prediction control unit configured to cause a prediction for an amount of surplus power defined as a difference between the power generated at the office by the power generation apparatus and the amount of power consumed by the office on a non-work day of the office; and a second prediction control unit configured to cause a prediction for a power capacity that can be accumulated by the each of the plurality of vehicles at the office on the non-work day; characterized in that the vehicle management system includes a selection control unit configured to cause a to-be-retained vehicle to be retained at the office and connected to the power generation apparatus of the office on the non-work day to be selected from among the plurality of vehicles on a basis of the amount of surplus power generated at the office on the non-work day and the power capacity that can be accumulated by the each of the plurality of vehicles at the office on the non-work day, and a charge/discharge control unit configured to cause an amount of charging/discharging of the to-be-retained vehicle on a work day of the office to be adjusted such that a remaining capacity of a battery included in the to-be-retained vehicle becomes equal to or less than a predetermined value before the non-work day, a first prediction control unit configured to cause a prediction for an amount of surplus power defined as a difference between the power generated at the office by the power generation apparatus and the amount of power consumed by the office on a non-work day of the office; and a second prediction control unit configured to cause a prediction for a power capacity that can be accumulated by the each of the plurality of vehicles at the office on the non-work day; characterized in that the vehicle management system includes a selection control unit configured to cause a to-be-retained vehicle to be retained at the office and connected to the power generation apparatus of the office on the non-work day to be selected from among the plurality of vehicles on a basis of the amount of surplus power generated at the office on the non-work day and the power capacity that can be accumulated by the each of the plurality of vehicles at the office on the non-work day, and a charge/discharge control unit configured to cause an amount of charging/discharging of the to-be-retained vehicle on a work day of the office to be adjusted such that a remaining capacity of a battery included in the to-be-retained vehicle becomes equal to or less than a predetermined value before the non-work day, wherein when the remaining capacity of the battery included in the to-be-retained vehicle on the work day of the office becomes higher than the predetermined value, the selection control unit is configured to cause another vehicle, which includes a battery having a remaining capacity lower than the predetermined value, to be selected from among the plurality of vehicles as a new to-be-retained vehicle to be retained at the office on the non-work day.