To provide a communication device, a communication system, a communication method and a communication program and a recording medium for the communication program, requiring no mounting of a means being capable of changing over and utilizing both a wire communication function and a radio communication function and being used for adjusting a function used in common for both communication functions in response to a utilized communication function, and a means for preventing the overlapping transmission and missing of data in the case of the changeover of the communication functions.
A communication control unit 2 for controlling operations related to a transmission and a reception and a digital modulator/demodulator 3 modulating transmitting data into baseband signals and digital-demodulating the received baseband signals are used in common regarding the wire communication function and the radio communication function.
Ryuichi Kijima
Ichiro Kaneko