A charging control device includes a plurality of battery packs including a secondary battery therein, one or two or more power input units configured to input power, a power integration unit configured to integrate the power input by the one or two or more power input units to one power, and a main control unit configured to measure the quantity of power input to the power integration unit and determine the quantity of power supplied from the power integration unit to the battery packs based on the measured quantity of power so as to control simultaneous charging of the plurality of battery packs.