A skin dose evaluation support apparatus is provided with a skin region contour creation unit that creates skin region information including the boundary coordinates of a skin region, based on image data to be inputted when a treatment plan for a radiation therapy for a patient is created and a display calculation unit that extracts a skin dose in a skin region, based on dose distribution data calculated by a dose distribution calculation unit of a treatment planning apparatus and the skin region information, and creates display data for displaying the extracted skin dose in a predetermined display format.
