An intermediation device and an intermediating method, capable of improving public interest in an industrial robot compared to before, are provided. The intermediation device is adapted to execute processings of receiving, from at least two manipulation terminals, or from at least one manipulation terminal and at least one computer, manipulation signals for manipulating at least two industrial robots each corresponding to the manipulation terminal or the computer and configured to perform a given work or a given game, causing the at least two industrial robots to perform the given work or the given game based on the manipulation signals, and causing a display unit held by an operator of the manipulation terminal to display an image of a site of the work or the game performed by the at least two industrial robots, the image being captured by an imaging device.