According to an embodiment, an information processing apparatus includes a position acquiring unit, and an occupancy level calculating unit. The position acquiring unit is configured to acquire position information representing a position where a target exists or no target exists, the position being measured by a sensor. The occupancy level calculating unit is configured to calculate an occupancy level distribution representing a level of occupancy, by the target, of each of a plurality of regions existing along a direction from the position of the sensor to the position indicated by the position information, based on the position information and measurement accuracy of the sensor, the occupancy level distribution being based on a non-measurement probability distribution representing a probability that measurement is not performed by the sensor.