Abstract: Disclosed is a bus bridge apparatus may prevent a transfer performance from being lowered due to bus protocol performance mismatch between interconnections. The bus bridge apparatus is used to transfer data to a slave device of a network-based interconnection from a master device of a bus-based interconnection, data of the master device may be buffered by an internal buffer, and may then be transferred to the slave device. At this time, lowering of a transfer efficiency may be prevented by converting a transfer timing of addresses and data to be optimized to a transfer protocol of the network-based interconnection through a protocol converter.