A method of controlling the charging of a battery includes determining plural pieces of state information of a battery unit based on a sensed physical quantity of the battery unit, calculating a weight of the battery unit based on the pieces of state information and a correspondence value of each of the plural pieces of state information, and defining, based on the weight, control information corresponding to an input physical quantity in a charging physical quantity of the battery unit, where the input physical quantity is input to a converter of the battery unit.