Provided is a distance measurement system, including: at least one sound source configured to generate an acoustic signal; an acoustic sensor including a plurality of directional acoustic sensors arranged to have directionalities different from one another; and at least one processor configured to: obtain a directionality of the acoustic signal in a particular direction based on at least one of a sum of output signals of the plurality of directional acoustic sensors or a difference between the output signals of the plurality of directional acoustic sensors, the at least one of the sum or the difference being based on applying a weight to at least one of the output signals; and determine a distance between the acoustic sensor and a reflection surface based on a time for the acoustic signal to arrive at the acoustic sensor in the particular direction after being generated and then reflected from the reflection surface.