A method for reading information from multiple riser cards is implemented by a BMC module that includes an SMBus controller, where the riser cards are electrically connected to the SMBus controller. The method includes steps of: accessing a lookup table and a plurality of bus addresses; scanning a target address for communicating with a target card; determining whether a slave address has been received from the target card; when the BMC module determines that the slave address has been received from the target card, reading a memory of the target card according to a target reading spec to obtain identification information; determining whether the identification information conforms to an FRU header format; and when the BMC module determines that the identification information conforms to the FRU header format, reading the memory of the target card to obtain FRU information.