1. An information processing device comprising: a human sensor that detects whether there are users within a detectable range; a system optimization processing section that calculates system control information for optimizing a system based on respective positions of the users detected by the human sensor; and a system controlling section that optimizes the system based on the system control information calculated by the system optimization processing section, wherein the system optimization processing section calculates system control information for optimizing an output of the system based on the respective positions of the users.