A method for estimating distribution of wireless signal strength, selecting measuring locations to measure wireless signal strength and compensating estimated wireless signal strength is provided, wherein the method for estimating distribution of wireless signal strength estimates the wireless signal strength at an estimation location in accordance with a plurality of single-reflection paths started from a signal emitter, the method for selecting position for measuring wireless signal strength determines whether a signal measuring process should be performed at the specific location, and the method for compensating estimated wireless signal strength compensates an estimated wireless signal strength near a specific location in accordance with a signal strength value measured at the specific location.