1. A load balancing method comprising the steps of: registering a business configuration definition of each business service including a schedule of the business service with a business configuration management repository; storing at least a service level objective of each business service; storing information on performance of each information processing module in a performance management table; reading the schedule of a designated business service from the business configuration definition registered with the business configuration management repository; acquiring the stored service level objective of the designated business service; partitioning the schedule of the designated business service read from the business configuration definition into a plurality of partial schedules according to the acquired service level objective; selecting one or more information processing modules whose performance information stored in the performance management table satisfies the service level objective in each partial schedule; and reserving the information processing modules selected satisfying the service level objective in the partial schedules as information processing modules for executing the designated business service in the schedule.