1. An information processing apparatus comprising: a scaling section that enlarges or reduces an input image provided to the information processing apparatus; a scanner that uses a window of a predetermined size to sequentially scan the input image; and a discriminator that discriminates whether the image received from the scanner is an object of interest, the discriminator comprising: a higher node having a plurality of weak discriminators that have learned a first learning sample of a first label and a second learning sample of a second label that has a predetermined coordinate relationship with the first learning sample of the first label; a first lower node having a plurality of weak discriminators that have learned the first learning sample of the first label based on the discrimination result of the higher node; and a second lower node that has no weak discriminator, wherein the first lower node performs an identification process on the input image in order to recognize an image of the first label based on the discrimination result of the higher node, and the second lower node performs an identification process on the input image in order to identify an image of the second label based on the discrimination result of the higher node by utilizing the weak discriminators in the first lower node according to the coordinate relationship.