A method for selecting a synchronization carrier, comprising determining, by a terminal, two or more synchronization carriers from a plurality of carriers, wherein synchronization information is provided on each of the synchronization carriers; and selecting, by the terminal, a first synchronization carrier from the two or more synchronization carriers based on reference information of the two or more synchronization carriers, wherein the first synchronization carrier is used for providing first synchronization information for each of the plurality of carriers, to enable the plurality of carriers to transmit data synchronously based on the first synchronization information; wherein for each of the two or more synchronization carriers, the reference information of the synchronization carrier comprises: a priority of the synchronization information on the synchronization carrier, and a Channel Busy Ratio, CBR, of the synchronization carrier; wherein selecting, by the terminal, the first synchronization carrier from the two or more synchronization carriers based on the reference information of the two or more synchronization carriers comprises: selecting, by the terminal, based on priorities of synchronization information on each of the synchronization carriers, a synchronization carrier having the synchronization information with a highest priority from the two or more synchronization carriers, to be the first synchronization carrier; and wherein the method further comprises: determining, by the terminal, the priorities of the synchronization information on the two or more synchronization carriers, according to at least configuration information of a base station or pre-configuration information. determining, by a terminal, two or more synchronization carriers from a plurality of carriers, wherein synchronization information is provided on each of the synchronization carriers; and selecting, by the terminal, a first synchronization carrier from the two or more synchronization carriers based on reference information of the two or more synchronization carriers, wherein the first synchronization carrier is used for providing first synchronization information for each of the plurality of carriers, to enable the plurality of carriers to transmit data synchronously based on the first synchronization information; wherein for each of the two or more synchronization carriers, the reference information of the synchronization carrier comprises: a priority of the synchronization information on the synchronization carrier, and a Channel Busy Ratio, CBR, of the synchronization carrier; wherein selecting, by the terminal, the first synchronization carrier from the two or more synchronization carriers based on the reference information of the two or more synchronization carriers comprises: selecting, by the terminal, based on priorities of synchronization information on each of the synchronization carriers, a synchronization carrier having the synchronization information with a highest priority from the two or more synchronization carriers, to be the first synchronization carrier; and wherein the method further comprises: determining, by the terminal, the priorities of the synchronization information on the two or more synchronization carriers, according to at least configuration information of a base station or pre-configuration information. a priority of the synchronization information on the synchronization carrier, and a Channel Busy Ratio, CBR, of the synchronization carrier; wherein selecting, by the terminal, the first synchronization carrier from the two or more synchronization carriers based on the reference information of the two or more synchronization carriers comprises: selecting, by the terminal, based on priorities of synchronization information on each of the synchronization carriers, a synchronization carrier having the synchronization information with a highest priority from the two or more synchronization carriers, to be the first synchronization carrier; and wherein the method further comprises: determining, by the terminal, the priorities of the synchronization information on the two or more synchronization carriers, according to at least configuration information of a base station or pre-configuration information. selecting, by the terminal, based on priorities of synchronization information on each of the synchronization carriers, a synchronization carrier having the synchronization information with a highest priority from the two or more synchronization carriers, to be the first synchronization carrier; and wherein the method further comprises: determining, by the terminal, the priorities of the synchronization information on the two or more synchronization carriers, according to at least configuration information of a base station or pre-configuration information. determining, by the terminal, the priorities of the synchronization information on the two or more synchronization carriers, according to at least configuration information of a base station or pre-configuration information.