The present disclosure provides a camera signal monitoring apparatus and method, the camera signal monitoring apparatus including a processor, which includes a vehicle information input unit for receiving a vehicle speed and a yaw rate signal of a vehicle; a camera information input unit for receiving a camera signal including a vehicle speed and a yaw rate signal from a vehicle front camera; and a monitoring unit for calculating a vehicle driving trajectory using the vehicle speed and the yaw rate signal of the vehicle input from the vehicle information input unit, calculating a reference curvature value based on the calculated vehicle driving trajectory, and determining a reliability by comparing the calculated reference curvature value with a curvature value calculated by the camera signal input from the camera information input unit.