A data synchronization method includes checking first to-be-checked information stored in an active area of a first board to obtain a first check result and second to-be-checked information stored in an active area of a second board to obtain a second check result before data synchronization, where the first board and the second board are include in an out-of-band management device, determining an active board and a standby board from the first board and the second board according to the first check result and the second check result, and synchronizing data in an active area of the active board to a standby area of the standby board. Hence, the method can be implemented to ensure validity of data synchronization.