The server acquires first data concerning a load applied to a body of an electric mobile apparatus, acquires second data concerning the performance of a storage battery mounted on the mobile apparatus, calculates a remaining lifetime of the body on the basis of the first data, calculates a remaining lifetime of the battery on the basis of the second data, compares the remaining lifetime of the body with the remaining lifetime of the storage battery, and instructs at least one of an activation of an unused function and an enhancement of a used function among a plurality of functions consuming the electric power of the mobile apparatus when the remaining lifetime of the body is shorter than the remaining lifetime of the storage battery.