A communication method, comprising: sending, by a first device, a handover request message to a second device, and receiving a handover acknowledgement message returned by the second device, wherein the handover acknowledgement message carries common system information of the second device, the first device is a serving base station that establishes a communication connection to a terminal in a mobility management process, and the second device is a candidate base station that can provide a communication connection for the terminal in the mobility management process; sending, by the first device, a handover command to the terminal, wherein the handover command comprises the common system information of the second device; the method being characterised by: sending, by the first device, a second message to the terminal based on a first message, so that the terminal obtains changed common system information of the second device based on the second message, wherein the first message is sent by the second device, and the first message is used to indicate a change occurring in the common system information of the second device, wherein the first message comprises second change indication information of the second device and an application condition of the second change indication information, wherein the second change indication information is used to indicate that the common system information of the second device changes when the application condition is met; and wherein the second message comprises the second change indication information of the second device and the application condition of the second change indication information, wherein the second change indication information is used to indicate that the common system information of the second device changes when the application condition is met. sending, by a first device, a handover request message to a second device, and receiving a handover acknowledgement message returned by the second device, wherein the handover acknowledgement message carries common system information of the second device, the first device is a serving base station that establishes a communication connection to a terminal in a mobility management process, and the second device is a candidate base station that can provide a communication connection for the terminal in the mobility management process; sending, by the first device, a handover command to the terminal, wherein the handover command comprises the common system information of the second device; the method being characterised by: sending, by the first device, a second message to the terminal based on a first message, so that the terminal obtains changed common system information of the second device based on the second message, wherein the first message is sent by the second device, and the first message is used to indicate a change occurring in the common system information of the second device, wherein the first message comprises second change indication information of the second device and an application condition of the second change indication information, wherein the second change indication information is used to indicate that the common system information of the second device changes when the application condition is met; and wherein the second message comprises the second change indication information of the second device and the application condition of the second change indication information, wherein the second change indication information is used to indicate that the common system information of the second device changes when the application condition is met. sending, by the first device, a second message to the terminal based on a first message, so that the terminal obtains changed common system information of the second device based on the second message, wherein the first message is sent by the second device, and the first message is used to indicate a change occurring in the common system information of the second device, wherein the first message comprises second change indication information of the second device and an application condition of the second change indication information, wherein the second change indication information is used to indicate that the common system information of the second device changes when the application condition is met; and wherein the second message comprises the second change indication information of the second device and the application condition of the second change indication information, wherein the second change indication information is used to indicate that the common system information of the second device changes when the application condition is met.