1. An image analysis apparatus comprising: component and space number calculation means for calculating, in a captured image (i) in which a tissue is captured and (ii) which has been binarized by use of a prescribed reference value as a threshold, (I) the number of connected components and (II) the number of spaces, each of the connected components being an aggregate of at least one component which is defined by connecting an outer edge(s) of the at least one component which is a graphic having a closed outer edge, each of the spaces being surrounded by an outer edge(s) of the at least one component; comparison value calculation means for calculating a comparison value which indicates a difference between the number of connected components and the number of spaces, both of which have been calculated by the component and space number calculation means; and determination means for determining, by comparing the comparison value calculated by the comparison value calculation means with a predetermined reference value, whether or not an image of a cancer tissue is included in the captured image.