A wireless charger for at least one mobile terminal in a vehicle , said wireless charger comprising: a power transmitter configured to wirelessly transmit power to a first of the at least one mobile terminal ; a memory configured to store frequency response characteristic data for each mobile terminal model; and a processor configured to: acquire model information of the first of the at least one mobile terminal , adjust parameters of the power based on the model information, acquire frequency characteristic data of power transmitted from the power transmitter; and detect a metallic foreign object by comparing frequency response characteristic data for each mobile terminal model and frequency characteristic data of the power; wherein the processor is configured to acquire the model information based on frequency response characteristic data of the first of the at least one mobile terminal, and wherein the processor is configured to detect a foreign object by comparing a gradient corresponding to a first section of a frequency response characteristic graph of the first of the at least one mobile terminal and a gradient corresponding to a first section of a frequency characteristic graph of the power. a power transmitter configured to wirelessly transmit power to a first of the at least one mobile terminal ; a memory configured to store frequency response characteristic data for each mobile terminal model; and a processor configured to: acquire model information of the first of the at least one mobile terminal , adjust parameters of the power based on the model information, acquire frequency characteristic data of power transmitted from the power transmitter; and detect a metallic foreign object by comparing frequency response characteristic data for each mobile terminal model and frequency characteristic data of the power; wherein the processor is configured to acquire the model information based on frequency response characteristic data of the first of the at least one mobile terminal, and wherein the processor is configured to detect a foreign object by comparing a gradient corresponding to a first section of a frequency response characteristic graph of the first of the at least one mobile terminal and a gradient corresponding to a first section of a frequency characteristic graph of the power. acquire model information of the first of the at least one mobile terminal , adjust parameters of the power based on the model information, acquire frequency characteristic data of power transmitted from the power transmitter; and detect a metallic foreign object by comparing frequency response characteristic data for each mobile terminal model and frequency characteristic data of the power; wherein the processor is configured to acquire the model information based on frequency response characteristic data of the first of the at least one mobile terminal, and wherein the processor is configured to detect a foreign object by comparing a gradient corresponding to a first section of a frequency response characteristic graph of the first of the at least one mobile terminal and a gradient corresponding to a first section of a frequency characteristic graph of the power. <EOS>