A server rack system includes a network switch, an Integrated Management Module (IMM) and in-rack apparatuses. The in-rack apparatuses and the IMM are connected to ports of the network switch respectively according to a preset correlation between in-rack locations and the ports of the network switch. The IMM pre-stores a correlation between identification information of the in-rack apparatuses, the in-rack locations and the ports. When the system is in operation, the IMM obtains a correlation between Media Access Control (MAC) addresses of the in-rack apparatuses and the ports from the network switch, and obtains a correlation between the identification information, the in-rack locations and the MAC addresses according to the correlation between the identification information, the in-rack locations, and the ports. The IMM obtains an Internet Protocol (IP) address corresponding to an MAC address, and uses the IP address to communicate with an in-rack apparatus in a specific rack location.