A charging method using a use point that is a unit, common to a plurality of apparatuses, of charging according to use thereof includes the steps of (a) converting a result of use of each of functions of each of the apparatuses to use points, (b) totaling the use points of each of the apparatuses obtained in the step (a) based on a predetermined unit, and (c) charging for use of each of the apparatuses based on the use points totaled in the step (b).