An abnormal shadow candidate detecting method, including a first smoothing processing process that performs a first smoothing processing of an inputted medical image and using a first smoothing filter; a second smoothing processing process that performs a second smoothing processing ON the medical image processed in the first smoothing processing process and using a second smoothing filter; an extracting process that extracts a detection object area for an abnormal shadow candidate in a size of a lesion part to be detected and based ON the medical image processed with the first smoothing processing and the medical image processed with the second smoothing processing; and an abnormal shadow candidate detecting process that performs detection of the abnormal shadow candidate and in the detection object area extracted from the inputted medical image.
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