A medical device system, the system comprising: an external device located outside a body of a user, the external device comprising: a data transceiver ; a power transmitter ; a coil connected to the data transceiver and the power transmitter ; and a controller configured to determine stimulus information based on biometric information of the user received by the data transceiver from an internal device inserted in the body of the user and configured to cause the data transceiver and the power transmitter to transmit wirelessly using the coil the stimulus information and power to the internal device to drive the internal device and to apply a stimulus in immediate response to the transmittal of and according to the transmitted stimulus information; and wherein the medical device system comprises the internal device configured to sense the biometric information of the user and to apply a stimulus according to the stimulus information to the user, based on the power wirelessly transferred from the external device without an internal power source; wherein the controller is configured to determine whether an urgent action is required to treat a disease or a symptom of the user based on the biometric information received from the internal device, whereby said controller is further configured, such that if the urgent action is required, the external device transmits the stimulus information and power to the internal device without involvement of a user terminal controlled by the user and an electronic device controlled by a medical specialist, and if the urgent action is not required, the external device transmits at least one of the biometric information and the determination result to the user terminal and the external device transmits at least one of the biometric information and the determination result to the electronic device . a data transceiver ; a power transmitter ; a coil connected to the data transceiver and the power transmitter ; and a controller configured to determine stimulus information based on biometric information of the user received by the data transceiver from an internal device inserted in the body of the user and configured to cause the data transceiver and the power transmitter to transmit wirelessly using the coil the stimulus information and power to the internal device to drive the internal device and to apply a stimulus in immediate response to the transmittal of and according to the transmitted stimulus information; and wherein the medical device system comprises the internal device configured to sense the biometric information of the user and to apply a stimulus according to the stimulus information to the user, based on the power wirelessly transferred from the external device without an internal power source; wherein the controller is configured to determine whether an urgent action is required to treat a disease or a symptom of the user based on the biometric information received from the internal device, whereby said controller is further configured, such that if the urgent action is required, the external device transmits the stimulus information and power to the internal device without involvement of a user terminal controlled by the user and an electronic device controlled by a medical specialist, and if the urgent action is not required, the external device transmits at least one of the biometric information and the determination result to the user terminal and the external device transmits at least one of the biometric information and the determination result to the electronic device . <EOS>