1. A method of compressing and pre-diagnosing an image in a three-dimensional remote ultrasound diagnostic apparatus, the method comprising: a first step of combining two-dimensional images scanned by a scanning unit and generating a three-dimensional volume image, by a processing unit; a second step of selecting a compression scheme for the three-dimensional volume image and compressing the three-dimensional volume image using the selected compression scheme; a third step of storing the compressed three-dimensional volume image in a database unit; a fourth step of pre-diagnosing an abnormal three-dimensional volume image from among stored three-dimensional volume images; and a fifth step of transmitting the abnormal three-dimensional volume image to a hospital capable of providing a diagnosis, by a data transmitting unit.