Method and apparatus for selecting information in a multi-dimensional space are provided. The method includes the steps of sensing the motion of a user intending to select information, and determining whether the sensed motion is an effective motion intended for information selection and returning to the sensing step if it is determined that the motion is not the effective one. Accordingly, difficulty in setting a predetermined threshold to a single value can be overcome. In addition, even a very slight motion can be accurately detected without being influenced by gravity and offsets. Moreover, it can be accurately determined whether a user's two- or three-dimensional motion is an effective motion for selecting information and which motion unit among at least two motion units has generated the effective motion, so that a high correct recognition rate for information and high reliability can be achieved, and a user is allowed to easily select information.