The article deals with the problem of man's inner subjective world regarded as a specific integral unity which is both the product and the producer of external forces. Some factors are presented responsible for appearance of the "core of the subjectivity", as well as environmental and age circumstances instrumental in development of the subjectivity. Individual style of activity is understood by the author as a wider notion than is conventionally accepted and as a manifestation of the subjectivity. The notion of the "small environment" is introduced to describe man's inner subjective world. In conclusion the notion of the subjectivity is related to some urgent problems in the field of practical education.