1. A learning apparatus comprising: feature extracting means for extracting a feature at a feature point in a plurality of training images including a training image that contains a target object to be recognized and a training image that does not contain the target object; tentative learner generating means for generating a tentative learner for detecting the target object in an image, the tentative learner being formed from a plurality of weak learners through statistical learning using the training images and the feature obtained from the training images; and learner generating means for generating a final learner that is formed from a plurality of weak learners and that detects the target object in an image by substituting the feature into a feature function formed from at least one of the weak learners that form the tentative learner so as to obtain a new feature and performing statistical learning using the new feature and the training images.