At least one candidate allocation time period is determined according to a resource benefit time step function. The resource benefit does not vary with time in the at least one candidate allocation time period. Resources and relations between the resources are converted into sub-resource groups according to the resource cost time step function. Each of the sub-resource groups comprise sub-resources that correspond to the resources and relations between the sub-resources. The resource benefits and resource costs of the sub-resources do not vary with time. With respect to the at least one candidate allocation time period, the sub-resource groups are input into a resource schedule optimizer to obtain optimized results with respect to the sub-resource groups. An optimized result, with respect to the at least one candidate allocation time period, is obtained from the optimized results with respect to the sub-resource groups.