A computer system has a plurality of computers each executing stream data processing and a management computer assigning a plurality of divided queries to the plurality of computers. The management computer includes a parameter input module configured to receive an analysis scenario including a plurality of queries and division information for dividing the analysis scenario into the plurality of divided queries; and a query analysis module configured to analyze the analysis scenario to generate a query graph. The query analysis module specifies, based on the analysis scenario and the division information, at least one of the divided queries that requires flow control; and sets the flow control for the plurality of computers to each of which the at least one of the divided queries that requires the flow control is to be assigned.