A robot arm system for controlling a motion of a robot arm includes an order determining section for determining an order of teaching information based on at least one or more pieces of perceptual information about circumference environment of the robot arm used by a person to operate the robot arm and change the motion of the robot arm that is sensed by the person, reaction time information as time information from a time when the person receives the perceptual information to a time when the person operates robot arm, and dispersion information about a dispersion level between at least one or more pieces of the teaching information or the perceptual information, and creates motion information about the robot arm based on the teaching information and the order determined by the order determining section.