An information processing system according to the present invention includes: an analysis device; and a control device. The analysis device performs first operations. The first operations includes: executing analysis, based on an analysis rule with respect to data to be input as an object of analysis; outputting an analysis result; managing the analysis rule; The analysis device store the analysis rule; and analysis state information indicating a state of the analysis to be generated or referred to by the first processor. The control device performs second operations. The second operations includes: monitoring a usage status of the first memory storing the analysis state information; acquiring and managing an evaluation result with respect to the analysis result; and controlling the analysis rule via the analysis device, based on a usage status of the first memory storing the analysis state information and the evaluation result.