A method for fracturing a rock multi-directionally includes: a borehole formation step of forming a borehole in a rock; a first fluid introduction step of introducing a first fluid to the borehole; a second fluid introduction pressurization fracturing step of introducing and pressurizing a second fluid to the borehole to generate a fractured portion around the borehole, and allowing the first fluid to close the fractured portion; and a pressurization fracturing step of continuously introducing and pressurizing the second fluid to the borehole even after the fractured portion is generated, and generating a fractured portion in a direction different from the fractured portion of the rock.