  Multi-robot systems are made up of a team of multiple robots, which provides
the advantage of performing complex tasks with high efficiency, flexibility,
and robustness. Although research on human-robot interaction is ongoing as
robots become more readily available and easier to use, the study of
interactions between a human and multiple robots represents a relatively new
field of research. In particular, how multi-robots could be used for everyday
users has not been extensively explored. Additionally, the impact of the
characteristics of multiple robots on human perception and cognition in human
multi-robot interaction should be further explored. In this paper, we
specifically focus on the benefits of physical affordances generated by the
movements of multi-robots, and investigate the effects of deictic movements of
multi-robots on information retrieval by conducting a delayed free recall task.
