A sidelink interface bearer configuration change method, applied to a first terminal, wherein the first terminal is a sidelink interface transmitting terminal, the method comprises: when a state of the first terminal is changed, obtaining sidelink radio bearer (SLRB) configuration information after the state of the first terminal is changed from a first network device serving the first terminal or from a protocol layer responsible for management of the SLRB configuration information of the first terminal; performing SLRB remapping of the sidelink interface according to the SLRB configuration information after the state of the first terminal is changed, wherein the performing SLRB remapping of the sidelink interface comprises: after sending End Marker Control PDU corresponding to the SLRB, performing SLRB reconfiguration, wherein after obtaining SLRB configuration information after the state of the first terminal is changed from a first network device serving the first terminal or from a protocol layer responsible for management of the SLRB configuration information of the first terminal, the method further comprises: transmitting indication information to a second terminal, wherein the second terminal is a communication terminal that forms a sidelink with the first terminal, and the indication information includes: a second type of indication information for indicating SLRB remapping of the sidelink interface. when a state of the first terminal is changed, obtaining sidelink radio bearer (SLRB) configuration information after the state of the first terminal is changed from a first network device serving the first terminal or from a protocol layer responsible for management of the SLRB configuration information of the first terminal; performing SLRB remapping of the sidelink interface according to the SLRB configuration information after the state of the first terminal is changed, wherein the performing SLRB remapping of the sidelink interface comprises: after sending End Marker Control PDU corresponding to the SLRB, performing SLRB reconfiguration, wherein after obtaining SLRB configuration information after the state of the first terminal is changed from a first network device serving the first terminal or from a protocol layer responsible for management of the SLRB configuration information of the first terminal, the method further comprises: transmitting indication information to a second terminal, wherein the second terminal is a communication terminal that forms a sidelink with the first terminal, and the indication information includes: a second type of indication information for indicating SLRB remapping of the sidelink interface. after sending End Marker Control PDU corresponding to the SLRB, performing SLRB reconfiguration, wherein after obtaining SLRB configuration information after the state of the first terminal is changed from a first network device serving the first terminal or from a protocol layer responsible for management of the SLRB configuration information of the first terminal, the method further comprises: transmitting indication information to a second terminal, wherein the second terminal is a communication terminal that forms a sidelink with the first terminal, and the indication information includes: a second type of indication information for indicating SLRB remapping of the sidelink interface.