To reduce time required for establishing diagnosis of a lesion candidate, a diagnostic imaging support system including a medical image shooting device for shooting an image of a subject and a medical image processing device for processing the medical image, the system including: a projection data acquisition part for acquiring projection data of the subject; a reconstruction part for reconstructing the medical image based on the projection data; an acquisition part for acquiring lesion candidate data which is data on lesion candidates detected from the medical image; a reconstruction condition decision part for deciding, on the basis of the lesion candidate data, a reconstruction condition for a magnified reconstruction image which includes the lesion candidates and is more magnified than the medical image; a magnification reconstruction part for reconstructing the magnified reconstruction image by using the reconstruction condition; and a display part for displaying the magnified reconstruction image.