A communication method performed by a terminal device (150, 1501, 1502), wherein the terminal device (150, 1501, 1502) supports a first user identity and a second user identity, and the method comprises: sending first information to a first access network device (160, 1601, 1602) by using the first user identity, wherein the first access network device (160, 1601, 1602) is an access network device (160, 1601, 1602) to which a first cell belongs, the first cell is a primary cell in which the terminal device (150, 1501, 1502) communicates with the first access network device (160, 1601, 1602) by using the first user identity, the first information comprises first indication information, a frequency band combination list supported by the terminal device (150, 1501, 1502), a radio resource control, RRC, status of the terminal device (150, 1501, 1502) in a second cell, and frequency band information of the second cell, the second cell is a cell on which the terminal device (150, 1501, 1502) camps by using the second user identity, and the first indication information is for indicating that the first user identity and the second user identity that are supported by the terminal device (150, 1501, 1502) share capabilities of the terminal device (150, 1501, 1502); and receiving first configuration information from the first access network device (160, 1601, 1602) by using the first user identity, wherein the first configuration information comprises information about a first secondary cell, and the first secondary cell is a secondary cell in which the terminal device (150, 1501, 1502) communicates with the first access network device (160, 1601, 1602) by using the first user identity. sending first information to a first access network device (160, 1601, 1602) by using the first user identity, wherein the first access network device (160, 1601, 1602) is an access network device (160, 1601, 1602) to which a first cell belongs, the first cell is a primary cell in which the terminal device (150, 1501, 1502) communicates with the first access network device (160, 1601, 1602) by using the first user identity, the first information comprises first indication information, a frequency band combination list supported by the terminal device (150, 1501, 1502), a radio resource control, RRC, status of the terminal device (150, 1501, 1502) in a second cell, and frequency band information of the second cell, the second cell is a cell on which the terminal device (150, 1501, 1502) camps by using the second user identity, and the first indication information is for indicating that the first user identity and the second user identity that are supported by the terminal device (150, 1501, 1502) share capabilities of the terminal device (150, 1501, 1502); and receiving first configuration information from the first access network device (160, 1601, 1602) by using the first user identity, wherein the first configuration information comprises information about a first secondary cell, and the first secondary cell is a secondary cell in which the terminal device (150, 1501, 1502) communicates with the first access network device (160, 1601, 1602) by using the first user identity.