Base station and data transfer method

A base station that forms a communication area enabling communication with a mobile communication network through a local network that includes the base station, the base station comprising:

• a monitoring unit that monitors an address assigned to a mobile terminal in the communication area, the address being assigned by the mobile communication network for data communication with the mobile communication network;
• a storage unit that stores combination information indicating a combination of the address monitored at the monitoring unit and identification information of the mobile terminal;
• a receiving unit that receives, from a communication terminal in the local network, data having the identification information;
• a comparing unit that compares the combination information stored in the storage unit with a combination of a destination address of the data and the identification information that is included in the data received by the receiving unit;
• and
• a transmitting unit that transmits, to the mobile terminal, the data received by the receiving unit when a result of comparison by the comparing unit indicates that the combination of the destination address and the identification information and the combination information coincide, and performs error processing when the result of comparison indicates that the combination of the destination address and the identification information and the combination information do not coincide.