Embodiments of the present invention disclose a mobile terminal control method, an apparatus, and a system. The method includes: receiving N direction-finding signals that are respectively sent by a multiple-antenna node at N moments, where the multiple-antenna node is located in an indoor-outdoor critical area; obtaining N pieces of location relationship information between a mobile terminal and the multiple-antenna node at the N moments according to the N direction-finding signals, where the N moments and the N pieces of location relationship information are in a one-to-one correspondence; determining location relationship change information between the mobile terminal and the multiple-antenna node according to at least M of the N pieces of location relationship information, where 2≤M≤N; and controlling the mobile terminal by matching the location relationship change information and according to the location relationship change information. Therefore, control accuracy of the mobile terminal can be improved.