A layout creation system is for jointly creating order data that determines a layout of a photo book by two or more users of two or more clients connected to a server via a network, and the system retains one piece of joint order data jointly created by the two or more users; receives an instruction to divide the joint order data as input by a relevant user; creates divided order data having the same layout as the joint order data in accordance with the instruction to divide the joint order data; and associates the divided order data with sharing users sharing the divided order data.