1. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a business flow analysis procedure, the business flow analysis procedure comprising: classifying specific process instances, each including a specific job section, among a plurality of process instances, each including a sequence of job names arranged in time series and time data of performed jobs, into a plurality of classifications, wherein the classifying comprises: first classifying the specific process instances among the process instances into each of process instances whose sequence of job names is completely identical; and second classifying the process instances classified at the first classifying into each of process instances whose route prior to the specific job section is identical; calculating, for each of the plurality of classifications, an average value and a standard deviation of transition periods that are differences between a start time and an end time of the specific job section in the specific process instances; identifying a classification of the specific process instances satisfying a predetermined condition that the standard deviation of the transition periods is less than a first threshold and whose average value of the transition periods or value calculated by adding the standard deviation to the average value of the transition periods is less than an average value of transition periods of all of the specific process instances, when a standard deviation of the transition periods for all of the specific process instances is greater than a second threshold, wherein a classification of the process instances whose route prior to the specific job section is identical has a priority in the identifying; comparing at least either of job or inter-job transitions, which are included in the specific process instance belonging to the identified classification, with at least either of jobs and inter-job transitions, which are included in the specific process instances belonging to classifications other than the identified classification, to extract at least either of a first feature job and a first feature inter-job transition, which are included in the specific process instance belonging to the identified classification, and at least either of a second feature job and a second feature inter-job transition, which are included in the specific process instances belonging to the classifications other than the identified classification; and outputting the extracted data to an output device.