The purpose of this study was to investigate communications in deception when the interpersonal system is in the centrifugal tendency. It is connected to two levels of systems: the interpersonal system and the conversational system. The interpersonal system is defined by relationships among persons. The conversational system is defined by the chain of events in the conversation. Participants were 20 pairs of undergraduates. Half of them were asked to tell their demerits and the rest were asked to answer negatively (deceptive condition) or affirmatively (truth condition). The results were as follows: (1) The deception lead the interpersonal system for the centripetal tendency when it is the centrifugal tendency. (2) In the deceptive condition participarts smile lesser than in the truth condition. (3) In the deceptive condition they talk longer, are reticent shorter, look at their partner longer and move their head to ask their partner's to respond more frequency. These results confirmed that in the truth condition, which the interpersonal system is more centrifugal, their communication leads in the interpersonal system have a centripetal tendency and, in the conversational system have a centrifugal tendency.