7. A robot control method performed by a computer of a robot control system including a robot that outputs an utterance content to a user in an exhibition hall placing an exhibition, comprising steps of: recording to a memory device an inspection action of the user at a time of attendance of the user in the exhibition hall as a history, the history comprises the exhibition placed in the hall and an inspection time period spent by the user for inspection as to the exhibition; when the user attends again, determining an appropriate utterance content by using the history associated with the attending user; and making the robot output the determined utterance content.
7. A robot control method performed by a computer of a robot control system including a robot that outputs an utterance content to a user in an exhibition hall placing an exhibition, comprising steps of: recording to a memory device an inspection action of the user at a time of attendance of the user in the exhibition hall as a history, the history comprises the exhibition placed in the hall and an inspection time period spent by the user for inspection as to the exhibition; when the user attends again, determining an appropriate utterance content by using the history associated with the attending user; and making the robot output the determined utterance content. 8. A robot control method according to claim 7 , wherein the history comprises a plurality of exhibitions placed in the hall and an inspection time period spent by the user for inspection as to respective exhibitions.