A communication control apparatus includes a storage unit and a processor. The storage unit stores, in association with a port number, first address information regarding apparatuses connected to a port identified by the port number. The processor receives a first affected address list containing second address information regarding apparatuses which may be affected by a trouble, extracts the first address information stored in the storage unit in association with a port number of a port via which the first affected address list has been received, selects third address information which is included in both the first and second address information, updates the first affected address list by replacing the second address information with the third address information to acquire a second affected address list, and transmits the second affected address list via each port other than the port via which the first affected address list has been received.