A work machine which includes a GNSS sensor that detects a GNSS signal and a marker detection sensor that detects a predetermined marker, and which is a self-propelled work machine that performs work in a work region based on results of detection by the GNSS sensor and the marker detection sensor, the work machine comprising a specification unit configured to specify a region in which accuracy of specifying a self-position of the work machine based on the GNSS sensor is lower than a reference in the work region, and a notification unit configured to notify a user of an installation position of the marker based on a result of specification by the specification unit.