A master server assigns a first process to each of a plurality of slave servers. When the master server receives one or more completion notifications of one or more first tasks of a first process related to a second task of a second process that is assigned to each of the plurality of slave servers and that is executed by using one or more execution results of the one or more first tasks, the master server estimates a processing amount of the second task. The master server sends information related to the estimated processing amount to the slave servers to each of which the second task is assigned.
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