A state evaluation function value generation unit 131 generates a state evaluation function value for each operating state based on a state/task-set correspondence table indicating a list of an operating state of a system including a plurality of processor-cores and correspondence of a task set to be operated in each operating state, and a task set parameter indicating a characteristic of each task constituting the task set. An integrated evaluation function value generation unit 132 generates an integrated evaluation function value in which the state evaluation function value of each operating state is integrated. An optimal allocation search unit 133 optimizes allocation of a task to be allocated to each of the plurality of processor-cores based on the integrated evaluation function value.