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: extracting a series of transaction records for each case from a database storing transaction records for processing results of respective performed jobs; generating a plurality of process instances respectively corresponding to the cases and including job names and time data of the performed jobs, which are arranged in a time series, and storing data of the process instance into a process instance data storage device; classifying process instances satisfying a designated condition concerning a specific job among process instances stored in the process instance storage device; calculating, for each classification of the process instances, an average value and a standard deviation of transition periods that are differences between a start time and an end time of a job section to be processed, in the process instances satisfying the designated condition, and storing the calculated average value and the calculated standard deviation into a storage device; identifying a classification of the process instances satisfying a predetermined condition representing that it is possible to reduce a transition period of the job section, based on the average value and the standard deviation, which are stored in the storage device; comparing either of jobs and inter-job transitions, which are included in the process instance belonging to the identified classification of the process instances satisfying the predetermined condition, with either of jobs and inter-job transitions, which are included in the process instances belonging to classifications of process instances that do not satisfy the predetermined condition, to extract either of a first feature job and a first feature inter-job transition, which are included in the process instance belonging to the identified classification of the process instances satisfying the predetermined condition, and either of a second feature job and a second feature inter-job transition, which are included in the process instances belonging to the classifications of the process instances that do not satisfy the predetermined condition; and outputting the extracted data to an output device.