A connection control system, comprising: a connection node configured to connect, upon receipt of a connection request including an identifier of a Subscriber Identity Module, SIM, from a terminal, the terminal to an Access Point Name, APN, as a connection destination associated with the identifier of the SIM; and a management server configured to change the APN as the connection destination associated with the identifier of the SIM in accordance with a change in a use state of the SIM, and deliver an association between the identifier of the SIM and the APN as the connection destination to the connection node; wherein the use state of the SIM changes in accordance with a state of a line of the identifier of the SIM; the connection control system further comprises a line-opening processing server configured to perform line-opening processing for the identifier of the SIM for which the line-opening processing is not performed; the connection node is further configured to transmit connection request including the identifier of the SIM for which the line-opening processing is not performed to a specific APN connected to the line-opening processing server; in a case where the line-opening processing of the identifier of the SIM is performed, the management server is further configured to change the connection destination associated with the identifier of the SIM to an APN other than the specific APN, and to deliver an association between the identifier of the SIM and the changed APN of the connection destination; characterized in that: the management server is further configured to manage the association between the identifier of the SIM and a partner code as well as the association between the partner code and the APN as the connection destination; the management server is further configured to change the connection destination to be associated with the identifier of the SIM to the APN of the partner code associated with the identifier of the SIM, in a case where the line-opening processing of the identifier of the SIM is performed; and the partner code is a code assigned to a partner company and indicating a peculiar condition for the changed APN desired by the partner company. a connection node configured to connect, upon receipt of a connection request including an identifier of a Subscriber Identity Module, SIM, from a terminal, the terminal to an Access Point Name, APN, as a connection destination associated with the identifier of the SIM; and a management server configured to change the APN as the connection destination associated with the identifier of the SIM in accordance with a change in a use state of the SIM, and deliver an association between the identifier of the SIM and the APN as the connection destination to the connection node; wherein the use state of the SIM changes in accordance with a state of a line of the identifier of the SIM; the connection control system further comprises a line-opening processing server configured to perform line-opening processing for the identifier of the SIM for which the line-opening processing is not performed; the connection node is further configured to transmit connection request including the identifier of the SIM for which the line-opening processing is not performed to a specific APN connected to the line-opening processing server; in a case where the line-opening processing of the identifier of the SIM is performed, the management server is further configured to change the connection destination associated with the identifier of the SIM to an APN other than the specific APN, and to deliver an association between the identifier of the SIM and the changed APN of the connection destination; characterized in that: the management server is further configured to manage the association between the identifier of the SIM and a partner code as well as the association between the partner code and the APN as the connection destination; the management server is further configured to change the connection destination to be associated with the identifier of the SIM to the APN of the partner code associated with the identifier of the SIM, in a case where the line-opening processing of the identifier of the SIM is performed; and the partner code is a code assigned to a partner company and indicating a peculiar condition for the changed APN desired by the partner company. the management server is further configured to manage the association between the identifier of the SIM and a partner code as well as the association between the partner code and the APN as the connection destination; the management server is further configured to change the connection destination to be associated with the identifier of the SIM to the APN of the partner code associated with the identifier of the SIM, in a case where the line-opening processing of the identifier of the SIM is performed; and the partner code is a code assigned to a partner company and indicating a peculiar condition for the changed APN desired by the partner company.