PURPOSE: To quantitatively display a loading position and the number of loading times and to attain the automation of loading, by calculating the loading position and the loading height looked from a distance/angle sensor.

CONSTITUTION: A distance/angle sensor 1 is provided to the setting position A above the bed 101 of a truck 100. Next, the distance sensor 10 of the distance/angle sensor 1 is rotated to an x-direction and the distance bi from the position A to each of the side parts e1, e2 of the bed 101 and a rotary angle αi are measured and, similarly, the distance sensor 10 is rotated to a y-direction and the distance C1 from the position A to the rear part of the bed 101, the distance Cn to the front part of the bed 101 and a rotary angle βj are measured. Subsequently, the width Zn and length Zy of the bed 101 are calculated by a first operation means and the loading position and loading height looked from the distance/angle sensor 1 are calculated by a second operation means. Thereafter, the objective values of the real loading position and loading height at each measuring point are compared by a third operation means to calculate the residual loading amount and loading possible position while the loading position and the number of loading times by a loaded article by a fourth operation means.