A management computer for managing a management target system comprises an operation situation evaluating part, an operation situation displaying part, an amelioration plan generating part, and an amelioration plan displaying part. The amelioration plan generating part identifies, as an amelioration plan, a business system configuration that ameliorates the operation situation of the business system that is in operation, based on operation situation value calculated by the operation situation evaluating part. The amelioration plan displaying part displays an operation situation that is expected in a case where a business system configuration identified by the amelioration plan generating part is applied, in association with the operation situation of the business system that is in operation.