An ultrasound diagnostic system including an ultrasound diagnostic device (1, 4, 5) configured to transmit an ultrasound beam toward a patient from an array transducer, receive an ultrasound echo from the patient, and create a test image of an intima-media thickness of a blood vessel, and a workstation connected to the ultrasound diagnostic device, the ultrasound diagnostic system comprising: a database configured to sequentially store the test image created by the ultrasound diagnostic device, wherein the workstation includes an input unit for allowing a user to input various kinds of information, a display unit, a workstation control unit, the workstation control unit being configured, after a current image that is a test image of a current test is created for the patient by the ultrasound diagnostic device (1, 4, 5), to: retrieve a one or more test images in respective past tests for the patient as one or more respective past images from the test images stored in the database,, make the display unit display (i) a retrieved past image, (ii) reduced retrieved past images as thumbnails and (iii) a report generation execution button, receive selection by the user via the input unit of one or more of the thumbnail images (T11-T13) and, in a case where a thumbnail image is selected, display the thumbnail image as highlighted, whereby a retrieved past image corresponding to the selected thumbnail image is displayed on the display unit as the past image, and a test report creation unit, the test report creation unit being configured, in response to selection by the user of the report generation execution button displayed on the display unit, to automatically create a test report on the basis of the current image and at least one past image selected by the user via the input unit from the one or more past images through selection of respective thumbnails displayed on the display unit. a database configured to sequentially store the test image created by the ultrasound diagnostic device, wherein the workstation includes an input unit for allowing a user to input various kinds of information, a display unit, a workstation control unit, the workstation control unit being configured, after a current image that is a test image of a current test is created for the patient by the ultrasound diagnostic device (1, 4, 5), to: retrieve a one or more test images in respective past tests for the patient as one or more respective past images from the test images stored in the database,, make the display unit display (i) a retrieved past image, (ii) reduced retrieved past images as thumbnails and (iii) a report generation execution button, receive selection by the user via the input unit of one or more of the thumbnail images (T11-T13) and, in a case where a thumbnail image is selected, display the thumbnail image as highlighted, whereby a retrieved past image corresponding to the selected thumbnail image is displayed on the display unit as the past image, and retrieve a one or more test images in respective past tests for the patient as one or more respective past images from the test images stored in the database,, make the display unit display (i) a retrieved past image, (ii) reduced retrieved past images as thumbnails and (iii) a report generation execution button, receive selection by the user via the input unit of one or more of the thumbnail images (T11-T13) and, in a case where a thumbnail image is selected, display the thumbnail image as highlighted, whereby a retrieved past image corresponding to the selected thumbnail image is displayed on the display unit as the past image, and a test report creation unit, the test report creation unit being configured, in response to selection by the user of the report generation execution button displayed on the display unit, to automatically create a test report on the basis of the current image and at least one past image selected by the user via the input unit from the one or more past images through selection of respective thumbnails displayed on the display unit.