There are provided a battery control system and a battery control method which can eliminate a management device controlling voltages of individual cells in a battery pack, resist the influence of noise, prevent an increase in size, and reduce the load on a management device. The battery control system comprises three or more than three communication devices and management devices. The communication device is corresponding to an independent battery and is preclassified. The management device sends a starting signal to the communication device of the highest level which comprises a first detecting unit, a first adjusting unit, a first communicating unit and a first control unit. A communication device of the lowest level comprises a second detecting unit, a second communicating unit, a second control unit and a second adjusting unit. Other communication devices comprise a third detecting unit, a third communicating unit, a third control unit and a third adjusting unit.