A fundamental idea for constructing a conscious robot is presented. First, hypotheses of the human mind are presented. The following ideas are shown: (1) The unconscious system is a recurrent network system made of various distributed subsystems. (2) Information of the mind such as intellect, feelings and willpower, is presumably processed in the unconscious system instead of the conscious system. (3) The conscious system just monitors, experiences afterward, models and memorizes the results of the unconscious system. (4) Realistic experiences of quality that the conscious system feels by itself are just illusions that are defined in the brain. Then an algorithm of a robot mind is constructed based on the hypotheses mentioned above. It is shown that a conscious mind of robots can be made using the proposed algorithm. Finally, purposes and issues of the robots with a mind are also discussed.