A communication apparatus which performs radio communication with a mobile terminal which is able to originate a call by using either a first or a second phone number as a caller source number, includes a radio interface unit which performs radio communication with the mobile terminal, and a transfer unit. When the radio communication unit receives a first call using the first phone number from the mobile terminal, the transfer unit transfers the first call from the mobile terminal to a first communication network corresponding to the first phone number to perform connection processing to a destination device. When the radio communication unit receives a second call using the second phone number from the mobile terminal, the transfer unit transfers the second call from the mobile terminal to a second communication network corresponding to the second phone number to perform the connection processing to a destination device.