Disclosed are an electric brake system and a control method thereof. The electric brake system includes a sensor part including at least three sensors among a motor position sensor MPS configured to measure a position of a motor, an acceleration sensor configured to measure a longitudinal acceleration of a vehicle, a wheel speed sensor configured to measure a wheel speed of the vehicle, and a pressure sensor configured to measure a brake hydraulic pressure of a wheel; and a controller configured to receive measured results from the at least three sensors among the motor position sensor MPS, the acceleration sensor, the wheel speed sensor, and the pressure sensor and determine that a sensor fails, which outputs a brake hydraulic pressure having a largest deviation among three or more brake hydraulic pressures that are estimated or measured from the at least three sensors.