A technique for aiding the determination of whether or not desired imaging can be performed by a mobile-type X-ray apparatus for X-ray imaging using a battery mounted therein as a drive source. From the imaging list showing scheduled imaging and pre-stored information about the power consumed when each region is imaged, a prediction of the consumption of the battery power of when all the imaging in the imaging list is performed is computed and presented together with the remaining battery power to the user. Various corrections can be applied to the computation. The difference between the remaining battery power and the predicted consumption of the battery power may be displayed.