A non-transitory computer readable medium stores a program causing a computer to execute a process. The process includes calculating a variance of acceleration in individual sections obtained by dividing, by a first predetermined time interval, acceleration information for multiple axis directions detected from a subject whose action is to be determined; extracting, as a first candidate region, a section with the largest variance of acceleration from among the sections; calculating a variance of acceleration in individual sections obtained by shifting the first candidate region forward and backward by a second predetermined time interval; selecting, as a second candidate region, a section with the largest variance of acceleration from among the first candidate region and the sections obtained by shifting the first candidate region forward and backward; calculating a feature value for the second candidate region; and determining the action of the subject based on the feature value.