A boarding and alighting time informing method includes a determination step for determining, at a stop where a bus stops, whether a person with disabilities is going to board the bus and whether a person with disabilities is going to alight from the bus, a prediction step for predicting a boarding and alighting time at the stop in either one or both of a case when it is determined that a person with disabilities is going to board the bus and a case when it is determined that a person with disabilities is going to alight from the bus, and an informing step for informing at least one of the inside and the outside of the bus about the predicted boarding and alighting time.