A method for unified communication of a server, a baseboard management controller, and a server is presented. A baseboard management controller (BMC) receives a first packet sent by a server, and forwards the received first packet to a physical network adapter of the BMC using a preconfigured virtual network adapter, where the first packet includes first management data or service data. The first packet is sent to an external network via the physical network adapter. The virtual network adapter is further configured to send a second packet received by the BMC to a control module of the BMC, and the control module processes the second packet. In the embodiments, the first packet is sent using an out-of-band physical network adapter of the BMC, which does not need to occupy a service network adapter of the server, thereby improving utilization of the service network adapter of the server.