A method for allocating processor resources and a terminal device are provided. The method includes the follows. Acquire n tasks running in parallel in a system, where n is an integer. The n tasks are classified into m task sets with each task set having a load level according to load capacities of the n tasks, where m is an integer. Demands of a current task set on processor resources are determined according to at least one of the number of tasks in the current task set and a load coefficient corresponding to a load level of the current task set. The demands on the processor resources are allocated for the current task set.