A radiation imaging apparatus comprising: an image capture unit capturing a radiation image a first decision unit deciding, as a first region of interest, a region of interest from a region of a first radiation image a first extraction unit extracting the first region of interest from the first radiation image a form decision unit deciding a first form from the first region of interest a first display unit enlarging and displaying the first region of interest a first search unit searching a region of a second radiation image for a second form similar to the first form a second decision unit deciding a second region of interest from the second radiation image so as to include the second form a second extraction unit extracting the second region of interest from the second radiation image and a second display unit enlarging and displaying the second region of interest.
