A storage module holds load information obtained by classifying a load on each of virtual machines into groups depending on a fluctuation characteristic. An allocation schedule creation module predicts the load on each of the virtual machines during a predetermined period based on the load information and a rule defined for each of the groups, determining, for each of the groups, an allocation amount of the physical computing resource to be allocated to at least one of the virtual machines classified into the each of the groups and a time slot for allocation based on the predicted load on each of the virtual machines, and creating a schedule including information on the allocation amount and the time slot that have been determined. A schedule execution module allocates the physical computing resource to each of the virtual machines based on the schedule.