A mobile terminal and controlling method thereof are disclosed, by which a scheduling function of giving a processing order to each of a plurality of tasks is supported. The present invention includes a memory including an operating system having a scheduler configured to perform a second scheduling function on a plurality of tasks, each having a processing order first-scheduled in accordance with a first reference and a processor performing an operation related to the operating system, the processor processing a plurality of the tasks. Moreover, if a first task among a plurality of the first-scheduled tasks meets a second reference, the scheduler performs the second scheduling function by changing the processing orders to enable the first task to be preferentially processed.