There is provided an ultrasound system for constructing or reconstructing an image with the use of pre-stored data and additional signals. The ultrasound system includes: a probe including a number of transducers for transmitting ultrasound transmission signals to a target object, receiving echo signals reflected from the target object and transducing the echo signals into electrical signals; an analog-to-digital conversion unit for converting the electrical signals into digital data; a transducer information collecting unit for collecting information on spatial states of the transducers at the time of receiving the echo signals; a beam-former for forming reception beams based on the converted digital data and the collected information; and an ultrasound image processing unit for reconstructing an ultrasound image based on the reception beams.