An operation management system includes a sensor section for detecting behavior of a vehicle, a recorder section for recording the behavior detected by the sensor section on a memory card, and a behavior analyzer for setting a condition pattern for determining the behavior of vehicle as dangerous behavior. The recorder section compares a condition pattern for recognizing the behavior of a vehicle as dangerous behavior with the behavior actually detected by the sensor section, and records only information relating to behavior compatible with the condition pattern on the memory card by dangerous behavior, and statistically analyzes it using the behavior analyzer.