1. An apparatus which examines brain functions of a subject comprising: two or more examining units of a pupillary change examining unit which examines characteristics of a pupil of the subject and which calculates a pupillary index, a visual system function examining unit which examines visual system functions of the subject and which calculates a visual index, an intelligence examining unit which carries out an intelligence test on the subject and which calculates an intelligence evaluating index, and a behavior examining unit which provides a behavior evaluating index that shows a result of behavior test of the subject; a memory device which stores a plurality of indexes presented by the two or more examining units; and an output unit which outputs the plurality of indexes stored in the memory unit.