An aerial-floating type communication relay apparatus (HAPS) is provided, which can perform a dynamic area control capable of coping with a change of distribution of terminal apparatuses in a service area configured with plural cells formed toward the ground, and that can suppress an increase of time required for area optimization. The aerial-staying type communication relay apparatus (HAPS) estimates positions of plural terminal apparatuses located in a service area, divides plural (L) kinds of antenna parameters of an antenna for service link into plural parameter groups, optimizes the antenna parameters based on estimation results of positions of the plural terminal apparatuses, for each of the parameter groups, and applies, to the antenna for service link, the optimum values of the plural (L) kinds of antenna parameters after completing the optimization for each of the parameter groups.