An ultrasound image diagnosis apparatus and an ultrasound image processing method that can automatically display a pair of a cardiac systolic end period image and a cardiac diastolic end period image based on living body signal data. A plurality of ultrasound images are collected from a patient and stored in a memory in correspondence with living body signal data, such as an ECG wave. When a freeze instruction is input during a reproduction of ultrasound images, a pair of images of a cardiac diastolic end period and a systolic end period is searched for going back from the freeze input time. A pair of the diastolic end period image and the systolic end period image is automatically displayed on a screen of the ultrasound image diagnosis apparatus.