An advertisement display apparatus, a method, and a non-transitory computer readable medium capable of calculating a display time for efficiently displaying an advertisement to a viewer are provided. An advertisement display apparatus according to the present disclosure includes an acquisition unit and a calculation unit. The acquisition unit acquires information about a region where a viewing terminal is located. The calculation unit calculates, for each region where a viewing terminal is located, the number of viewing terminals in that region based on information about that region, and calculate, for each region, a display time of an advertisement in that region based on the number of viewing terminals in that region.