A synchronization method, wherein the method comprises: associating a server with a first terminal, and receiving data uploaded by the first terminal; and associating the server with at least one second terminal, and acquiring information of the at least one second terminal, wherein the associating comprises logging in of the first terminal to the server; and when the server determines that the first terminal and the at least one second terminal are in a same local area network, sending, by the server, after the logging in to the server a notification to the first terminal, wherein the notification comprises the information of the at least one second terminal, and the at least one second terminal and the first terminal are in the same local area network; receiving, by the server, an indication message sent by the first terminal, wherein the indication message is used to indicate that the first terminal sends, in the local area network, the data to the at least one second terminal; receiving, by the server, a verification request sent by the at least one second terminal, wherein the verification request comprises identity information of the data that is sent by the first terminal in the local area network and received by the at least one second terminal, and the verification request is used to request the server to verify whether the identity information matches the data that is uploaded by the first terminal and received by the server; and when it is confirmed that the data that is uploaded by the first terminal and received by the server is consistent with the identity information, sending, by the server, confirmation information to the at least one second terminal, wherein the confirmation information is used to confirm that the data received by the at least one second terminal matches the data received by the server. associating a server with a first terminal, and receiving data uploaded by the first terminal; and associating the server with at least one second terminal, and acquiring information of the at least one second terminal, wherein the associating comprises logging in of the first terminal to the server; and when the server determines that the first terminal and the at least one second terminal are in a same local area network, sending, by the server, after the logging in to the server a notification to the first terminal, wherein the notification comprises the information of the at least one second terminal, and the at least one second terminal and the first terminal are in the same local area network; receiving, by the server, an indication message sent by the first terminal, wherein the indication message is used to indicate that the first terminal sends, in the local area network, the data to the at least one second terminal; receiving, by the server, a verification request sent by the at least one second terminal, wherein the verification request comprises identity information of the data that is sent by the first terminal in the local area network and received by the at least one second terminal, and the verification request is used to request the server to verify whether the identity information matches the data that is uploaded by the first terminal and received by the server; and when it is confirmed that the data that is uploaded by the first terminal and received by the server is consistent with the identity information, sending, by the server, confirmation information to the at least one second terminal, wherein the confirmation information is used to confirm that the data received by the at least one second terminal matches the data received by the server.