News editors obtained the following quote from the background information suppli ed by the inventors: “Conventionally, there has been known a robot management sy stem that collectively manages tasks by multiple mobile robots in a specific reg ion (for example, see Japanese Patent Laid-Open No. 2020-113086). For multiple u nmanned delivery vehicles, which are exemplary mobile robots, the above Patent L iterature describes a system that determines an unmanned vehicle to pick up a pa rcel that is a collection target in response to a collection request based on th e delivery plan of each unmanned vehicle.”