An execution multiplicity control system is provided which measures a load distribution over service objects for each case when one type of service requests are inputted into a distributed object system; calculates an effect index for when the execution multiplicity of each of the service objects is varied, based on the load distribution; measures, for each type of the service requests, the number of service requests actually inputted, to acquire a request distribution; calculates and stores a total effect index for when the execution multiplicity of each of the service objects is varied, based on the effect index and the request distribution; and controls the execution multiplicity of the service objects by applying a method of controlling the execution multiplicity of the service objects in descending order of the respective total effect indices calculated.