An information processing device for managing a vehicle including a toilet unit, a tank unit connected to the toilet unit for storing waste that flows from the toilet unit, and a traveling unit capable of moving the toilet unit and the tank unit. The information processing device performs control for disconnecting the traveling unit from the toilet unit and the tank unit when installing a toilet. The information processing device includes a control unit configured to acquire a storage amount of waste in the tank unit and to generate commands to the traveling unit to cause the traveling unit to replace the tank unit when the storage amount of waste becomes equal to or larger than a predetermined amount.