PROBLEM TO BE SOLVED: To provide a load distribution system capable of suppressing increase of load following to increase and decrease of servers, and eliminating deviation of load between servers.SOLUTION: A slot group creation device creates a maximum slot row when a system is a maximum configuration, in a load distribution system for distributing load among plural servers. Then, the slot group creation device creates a slot row when a number of servers is reduced from the load distribution system, with the maximum slot row being a base. At the time, the slot group creation device creates an extension slot row formed by copying and connecting the maximum slot row, at first. The slot group creation device creates a slot row in which an appearance part of the server to be eliminated is substituted to other server, from the extension slot row. The substitution is performed so that, respective appearance number of basic arrangements of servers which are not eliminated becomes equal as possible. Then the slot gr
