Ubiquitous computing is expected to realize an environment, where anyone can get benefit of information services anywhere and anytime, and to become a complex system consisting of enormous numbers of software agents working parallel in a distributed manner.

To provide various information services in such ubiquitous computing environment, we are designing and implementing multiagent architecture CONSORTS that is a middleware to organize several kinds of information services with linking digital information and real physical world.

Multiagent is an approach to describe, implement, and analyze systems as emergent phenomena through interactions among agents that have their own behavior algorithms.

One of the key concepts of CONSORTS is 'semantic grounding' that grounds objects in digital world to real physical world. Another key concept is 'service coordination', by which we can flexibly access information services through service composition.

The application images in CONSORTS cover wider areas discussed in other approaches in ubiquitous computing. For instance, it includes 1) social resource allocation: coordination among users' behaviors in traffic system or appointment system for public services by spatio-temporal resource allocation, and 2) information circulation with semantic formalization by ontology that is general dictionary of concepts in the sense of information science.