A wireless communications system, the wireless communications system comprising a user terminal, a first node and a second node; the user terminal, comprising: a first receiving unit, configured to receive a first message from the first node, wherein the first message comprises a configuration of the second node and/or a dual connectivity configuration; and a first processing unit, configured to: send a first reply message to the first node if the configuration in the first message is accepted, so that the first node learns that the user terminal accepts the configuration; or send a second reply message to the first node if the configuration in the first message is not accepted, so that the first node learns that the user terminal does not accept the configuration; or skip sending any message to the first node if the configuration in the first message is not accepted; the first node comprising: a second sending unit, configured to send the first message to a user terminal; and a second receiving unit, configured to: receive the first reply message from the user terminal to learn that the user terminal accepts the configuration; or receive the second reply message from the user terminal to learn that the user terminal does not accept the configuration; wherein the second sending unit is further configured to: if the first reply message is received from the user terminal, send, according to the first reply message, a second message to the second node to indicate a configuration success of the user terminal; or if the second reply message is received from the user terminal, send, according to the second reply message, a third message to the second node to indicate a configuration failure of the user terminal. a first receiving unit, configured to receive a first message from the first node, wherein the first message comprises a configuration of the second node and/or a dual connectivity configuration; and a first processing unit, configured to: send a first reply message to the first node if the configuration in the first message is accepted, so that the first node learns that the user terminal accepts the configuration; or send a second reply message to the first node if the configuration in the first message is not accepted, so that the first node learns that the user terminal does not accept the configuration; or skip sending any message to the first node if the configuration in the first message is not accepted; a second sending unit, configured to send the first message to a user terminal; and a second receiving unit, configured to: receive the first reply message from the user terminal to learn that the user terminal accepts the configuration; or receive the second reply message from the user terminal to learn that the user terminal does not accept the configuration; wherein the second sending unit is further configured to: if the first reply message is received from the user terminal, send, according to the first reply message, a second message to the second node to indicate a configuration success of the user terminal; or if the second reply message is received from the user terminal, send, according to the second reply message, a third message to the second node to indicate a configuration failure of the user terminal.