A present invention relates to a combined accelerometer and gyroscope system including a combined accelerometer and gyroscope for maintaining vibration of a mass body at a constant amplitude using an applied drive voltage, and detecting vibration signals in directions of an acceleration axis and an angular velocity axis. An acceleration signal obtainment unit obtains the vibration signal in the direction of the acceleration axis. An amplitude control unit outputs an acceleration control signal using the vibration signal. An acceleration driving input unit receives a voltage signal from the amplitude control unit and applies the voltage signal to the combined accelerometer and gyroscope. An angular velocity signal obtainment unit obtains the vibration signal in the direction of the angular velocity axis. A force balance control unit outputs an angular velocity control signal using the vibration signal received from the angular velocity signal obtainment unit. An angular velocity driving input unit receives a voltage signal received from the force balance control unit and applies the voltage signal to the combined accelerometer and gyroscope.