A detection system includes an image processing apparatus configured to discriminate whether or not there is a detection target contained in an object, using a discriminator, and an information processing apparatus configured to provide the discriminator to the image processing apparatus. The information processing apparatus includes an evaluation unit configured to evaluate, for each attribute, discrimination precisions of the discriminator before and after the additional training, using evaluation data associated with each of a plurality of attributes of an object, when the discriminator is additionally trained using the training data, and an output unit configured to output the discrimination precisions for each attribute.