A mother board is disclosed. The mother board includes a first processor and a controlling module. A second processor is electrically coupled to the mother board. The controlling module includes a utilization ratio comparing unit and a controlling unit. The utilization ratio comparing unit is configured for comparing a current utilization ratio of the first processor with a predetermined first utilization ratio, and comparing a current utilization ratio of the second processor with a predetermined second utilization ratio. The controlling unit is configured for controlling the first processor and the second processor to process data together when the current utilization ratio of the first processor is lower than the predetermined first utilization ratio and the current utilization ratio of the second processor is higher than the predetermined second utilization ratio.