To enable accurate detection of a moving body that has fraudulently entered a monitored area, a moving body management device comprises: a reception unit that receives moving body identification information enabling identification of a moving body and representing the state of the moving body from an information processing terminal device that has received the moving body identification information from the moving body that has transmitted the moving body identification information; a determination unit that determines whether or not the moving body has entered an entry-prohibited area by comparing the received moving body identification information with entry permission management information representing an area that the moving body is permitted to enter or prohibited from entering; and a transmission unit that transmits a determination result obtained by the determination unit to the information processing terminal device capable of displaying the determination result.