Provided are a method for controlling a heliostat used for collecting of sunlight and a device of the method that achieve: a high sunlight collecting efficiency with a high light collecting rate by allowing no deviation of a light collecting point (a focal point) of sunlight; and a high area arrangement efficiency by having such a configuration in which no rotation by means of a rotation mechanism is carried out. The method is a method for controlling a heliostat being used for collecting of sunlight and having multiple reflecting mirrors in a way that the heliostat tracks the sun in motion, reflects sunlight, and collects the sunlight at a predetermined focal point. The method includes: a step of adjusting the multiple reflecting mirrors so that the multiple reflecting mirrors have a focal point at a predetermined distance; and a step of controlling the multiple reflecting mirrors to track the sun while light beams reflected from the reflecting mirrors have a focal point at an arbitrary point, the multiple reflecting mirrors being configured to tilt in conjunction with each other. In the method, while maintaining a state where the coordinates of predetermined points of the respective reflecting mirrors are fixed, the reflecting mirrors are operated in conjunction with each other.