There are provided an ultrasonic apparatus and a beamforming method for the ultrasonic apparatus. According to an aspect, an ultrasonic apparatus includes a 2D array transducer in which a plurality of elements are arranged in a plurality of rows and columns a signal supplier configured to supply an ultrasonic signal to the 2D array transducer a first delayer configured to delay the ultrasonic signal to output a plurality of first delay signals corresponding to any one of the number of rows and the number of columns and a second delayer configured to delay one of the plurality of first delay signals to output a plurality of second delay signals corresponding to the other one of the number of rows and the number of columns, and transmit the plurality of second delay signals to the 2D array transducer.
