Research on human-robot interaction is getting an increasing amount of attention. Because almost all the research has dealt with communication between one robot and one person, quite little is known about communication between a robot and multiple people. We developed a method that enables robots to communicate with multiple people by selecting an interactive partner using criteria based on the concept of proxemics. In this method, a robot changes active sensory-motor modalities based on the interaction distance between itself and a person. Our method was implemented in a humanoid robot, SIG2, using a subsumption architecture. SIG2 has various sensory-motor modalities to interact with humans. A demonstration of SIG2 showed that the proposed method works well during interaction with multiple people.