Communication control apparatus and communication control method

A communication control apparatus for executing a data transfer process between an external network and an internal network, comprising:

• a plurality of first ports respectively connected to a plurality of network segments composing the internal network;
• a second port connected to the external network;
• a storage unit;
• a determining unit which determines whether or not environment setting information to specify an operation environment of the communication control apparatus relating to a data transfer process of network layer level is stored in the storage unit;
• and
• an executing unit which executes the data transfer process at the network layer level between the second port and each of the plurality of first ports based on the environment setting information when the determining unit determinates that the environment setting information is stored in the storage unit and executes a data transfer process at data link layer level among all ports including the second port and the plurality of first ports when the determining unit determinates that the environment setting information is not stored in the storage unit.