This paper proposes a new modeling method of interactions in software development process, which focuses on the interactions among the elements of the process, and a new software development environment based on the model. In this method, interactions in software process is modeled as a set of agents and communication channels. Agent acts interaction between other agents with channels. Channels are classified by their contents and types of interaction. A prototype of supporting environment for the software development which stands on the model is also developed. The environment consists of proxy program for agent and integrated communication server, which provides mechanism for interaction, execution of process, and user navigation.