The article justified the need for the development of IT competence of teachers in the structure and logic of professional and pedagogical competence. The system of advanced training of NCAT “Orleu” is considered as a personalized educational environment for the development of the researched competence. The methodology of the research carried out in the subsidiary NCAT “Orleu” in the North Kazakhstan region is presented. At the same time, the results of a survey of teachers of the region are shown, the system of work in the conditions of post-course support of the development of IT competence is described, and the positive dynamics of the researched development through the data of aspect monitoring is substantiated. Based on the results of the research, the conclusions about the effectiveness of the three-unified approach in professional development, its resources and educational environment for the systematic and managed/self-managed development of IT competence were formulated ,that is came out in the processes of purposeful learning and motivated self-education of teachers, their self-realization and enhancement in the creation of digital didactic products and their methodologically applying and using in their own practice.