1. A medical image diagnostic apparatus, comprising: processing circuitry configured to accept input of conditions with respect to diagnosis regions to be scanned and arrangement of the diagnosis regions in volume data; extract a region of interest that is set according to the diagnosis regions by analyzing the volume data acquired based on the accepted conditions and determine a portion of the extracted region of interest in the diagnosis regions; set each generating condition of a plurality of parallax image groups that are generated from the volume data to display the diagnosis regions while rotating the diagnosis regions and a condition with respect to the rotation and stopping of the diagnosis regions, based on the arrangement of the diagnosis regions in the volume data, the position of the extracted region of interest in the diagnosis regions, and a type of the extracted region of interest; and perform control to display the plurality of parallax image groups generated by each generating condition on a display having a stereoscopic viewing function, based on the condition with respect to the rotation and the stopping of the diagnosis regions.