1. A log analysis method comprising: executing a program a plurality of times; generating a plurality of logs, each log being recorded a plurality of events occurring upon the execution of the program according to an occurrence order of each of the events in each of the logs; performing a first calculation to calculate an event occurrence probability, for the occurrence order of each event, based on at least one from the program description concerning each event recorded in the logs and the data to be used upon the execution of the program description; and outputting information concerning an event which corresponds to a characteristic included in the logs, based on the event occurrence probability.