A communication device comprising: a communication unit that has adjustable communication characteristics, and includes a communication antenna that performs transmission and reception of a carrier wave, an adjustment unit that adjusts the communication characteristics on the basis of the transmitted adjustment signal, a processing unit that transmits the adjustment signal to the adjustment unit on the basis of an adjustment command transmitted from the adjustment control unit, and a resonance circuit provided with a coil having a predetermined inductance and a capacitor having a predetermined capacitance; a setting unit that sets adjustment values used in adjustment of the communication characteristics of the communication unit on the basis of parameters corresponding to a target application; and an adjustment control unit that controls the communication unit to adjust the communication characteristics on the basis of the adjustment values, wherein when there are a plurality of target applications, the setting unit determines overlapping parameters of adjustable communication characteristics, the overlapping parameters being adjustment values that are usable by the plurality of target applications for a particular adjustable communication characteristic, such that the plurality of target applications perform the communication on the basis of the parameters of each application, and sets adjustment values corresponding to the overlapping parameters of the communication characteristics, wherein the adjustment unit comprises a plurality of parallel Q value adjusting units, each comprising a resistor with a different resistance and a switching element for selectively switching each resistor, the resistors being directly connected with the antenna port, and the communication unit is operable to adjust a Q value of the communication antenna by selectively switching the switching elements, and wherein when there is no overlapping parameter of the communication characteristics, the setting unit resets the target application to one or more reset target applications that are estimated to be usable, and sets the adjustment values on the basis of the parameters of each reset target application. a communication unit that has adjustable communication characteristics, and includes a communication antenna that performs transmission and reception of a carrier wave, an adjustment unit that adjusts the communication characteristics on the basis of the transmitted adjustment signal, a processing unit that transmits the adjustment signal to the adjustment unit on the basis of an adjustment command transmitted from the adjustment control unit, and a resonance circuit provided with a coil having a predetermined inductance and a capacitor having a predetermined capacitance; a setting unit that sets adjustment values used in adjustment of the communication characteristics of the communication unit on the basis of parameters corresponding to a target application; and an adjustment control unit that controls the communication unit to adjust the communication characteristics on the basis of the adjustment values, wherein when there are a plurality of target applications, the setting unit determines overlapping parameters of adjustable communication characteristics, the overlapping parameters being adjustment values that are usable by the plurality of target applications for a particular adjustable communication characteristic, such that the plurality of target applications perform the communication on the basis of the parameters of each application, and sets adjustment values corresponding to the overlapping parameters of the communication characteristics, wherein the adjustment unit comprises a plurality of parallel Q value adjusting units, each comprising a resistor with a different resistance and a switching element for selectively switching each resistor, the resistors being directly connected with the antenna port, and the communication unit is operable to adjust a Q value of the communication antenna by selectively switching the switching elements, and wherein when there is no overlapping parameter of the communication characteristics, the setting unit resets the target application to one or more reset target applications that are estimated to be usable, and sets the adjustment values on the basis of the parameters of each reset target application.