The first autonomous mobile object includes a first controller that controls autonomous movement based on an operation command and a first carrying unit that carries the second autonomous mobile object. The second autonomous mobile object includes a second controller that controls autonomous movement based on the operation command, a payment unit that performs payment for merchandise in a designated store, and a second carrying unit that carries the merchandise. The operation command includes a command that causes the first autonomous mobile object carrying the second autonomous mobile object to move to the store, a command that causes the second autonomous mobile object to get off at the store, move into the store, to perform payment for merchandise, and to carry the merchandise, to get on the first autonomous mobile object, and a command that causes the first autonomous mobile object to move to a designated delivery place.