A flow generating method includes steps of; first identifying, from a plurality of occurrence events recorded as log data, numbers of occurrences of transitions for respective pairs of a transition source and destination occurrence events; second identifying occurrence order patterns and numbers of occurrences for the respective occurrence order patterns, for each of a plurality of occurrence event groups which includes two or more pairs selected in a descending order of the number of occurrences and has a different number of the occurrence events; calculating a degree of concentration and a degree of inequality to an average value of a distribution of the numbers of occurrences for the respective identified occurrence order patterns; and generating a flow of the occurrence events based on an occurrence event group in which the degree of inequality is greater than or equal to a first threshold and the degree of concentration is the lowest.