This application provides an information processing method and a communications device. This implements monitoring on a first time window by a first communications device, and avoids a problem that a time window cannot be monitored. An information processing method includes: A first communications device receives first information from a second communications device. The first communications device determines, based on the first information, that a start location of a first time window is a K1 th time unit after a start location of a first resource or the start location of the first time window is a K2 th time unit after an end location of the first resource. The first resource is a resource used by the first communications device to transmit data, and K1 and K2 are positive integers. The first communications device monitors, based on the determined start location of the first time window, control information sent by the second communications device.