As Japan has become one of the fastest-aging societies in the world, it is important to improve the quality of our health maintenance management and preventive medical care to extend healthy life expectancy. We believe advanced implementation of Information and Communications Technologies (ICT) may improve the medical services and health maintenance management. In this paper, we discuss the potentialities and expansibility of the XML Web Services based on the Adaptive Collaboration (AC) to improve the quality of the Japanese medical services. By examining the experimental pilot studies on the XML Web Services, we would like to present ways of improving health maintenance service and regional medical services. In order to realize better health maintenance and prevention of disease, we would like to prove that incorporating medicine, life, and work through the XML Web Services is highly effectiveness.