A transport assisting method includes: setting a target position of the radiation-irradiation device where the radiation source is capable of being disposed at a radiation-irradiation position where a radiation image is capable of being taken with respect to the radiation image recording medium in a movable range where the position of the radiation source is capable of being changed by the radiation source holding unit and a work space is capable of being secured around the radiation-irradiation device； detecting a current position of the radiation-irradiation device； detecting a position of an obstacle that obstructs the transport of the radiation-irradiation device； and notifying the user of the transport assistance of the radiation-irradiation device to the target position on the basis of the target position, the current position, and the position of the obstacle.
