Disclosed is a ultrasonic diagnostic apparatus an a method of controlling the same, capable of allowing a sonographer to take an appropriate rest by measuring the usage time and the angle of bend of the probe and assigning weights to the usage time and the angle of bend of the probe such that the wrist fatigue of a sonographer is determined, and warning the sonographer about the determined wrist fatigue, the ultrasonic diagnostic apparatus including a probe configured to transmit an ultrasonic signal to a target object and receive a ultrasonic signal reflected from the target object; a storage configured to store a weight that is determined on the basis of a type of the probe and an application of the probe; and a controller configured to determine a wrist fatigue of a user who uses the probe on the basis of the stored weight and a usage time of the probe.