The goals, objectives and algorithm of Internet-based system for collecting and processing of data on health-related quality of life (HRQOL) of the population are described. A concept of long, systematic, network-centric measurement of HRQOL for most of the population is offered. System to provide assessment of HRQOL thresholds indicators is suggested that leads to treatment or medical assistance, as well as assessment of the relationship of qualitative and quantitative characteristics of the treatment and its results to changes in HRQOL level of performance; rating calculation for different methods of treatment, health care facilities and specific doctors based on comparative data about their impact on the HRQOL of patients. Structure of relationships and dependencies of parites in diagnostic and treatment process are discussed.