VEHICLE MANAGEMENT METHOD, VEHICLE MANAGEMENT SYSTEM, AND COMPUTER SYSTEM

A vehicle management method includes: obtaining first SOH information that indicates a degree of deterioration of a power storage device of a vehicle based on charge data on the power storage device measured while the vehicle is executing external charge of the power storage device using power supplied externally; obtaining second SOH information that indicates the degree of deterioration of the power storage device based on history data about deterioration of the power storage device recorded in the vehicle when the vehicle is not executing external charge of the power storage device; and determining whether the history data have been tampered with by comparing the first SOH information and the second SOH information.