1. A block mapping method in a reconfigurable multi-processor system including a host processor that executes at least one function, a reconfigurable processor that reconfigures a portion of the function and executes the function, and a memory, the function mapping method comprising: mapping the at least one function to the reconfigurable processor in such a manner that only one of the at least one function may be mapped to the reconfigurable processor at each point of time; and when a task is created in the reconfigurable multi-processor system, dynamically mapping the mapped function and a function of the created task such that the reconfiguration number of the reconfigurable processor is minimized, wherein the host processor requests the reconfigurable processor to reconfigure the function of the created task, the host processor executes the function of the created task, when the reconfigurable processor is in the process of executing the mapped function, and wherein the host processor executes an overall function of application and multitasking, and the function mapping.