1. A movement determination apparatus comprising: a memory; and a processor coupled to the memory, the processor configured to acquire an error region in which an object is likely to exist or an estimated coordinate point at which the object is estimated to exist, classify the acquired error region or the acquired estimated coordinate point into a plurality of measurement segments, estimate existence regions of the object in the plurality of measurement segments, on a basis of the classified plurality of the acquired error region or the acquired estimated coordinate point, calculate a quantity of change between a first existence region and a second existence region of the existence regions based on coordinate points and shapes of the first existence region and the second existence region, and determine movement of the object position by comparing the existence regions based on the quantity of change.