A data management system deploys a number of server cabinets each deploying a number of servers. Each server is coupled to a data center network. The data management system includes a processor and a storage unit coupled to the processor. The processor is configured to pre-obtain a MAC address and location information pair of every server, save the information pair as a computer-readable document, obtain a MAC address of a server to be queried, and compare the MAC address of the server to be queried to the computer-readable document and obtain the physical address of the server to be queried. The information pair includes information of the MAC address and a corresponding physical location.