Giso means reporting conclusions about state affairs to the throne after deliberation by Dijokan (Grand Council of State) under the ritsuryo system (a system of centralized government based on the ritsuryo code).
議奏（ぎそう）とは、律令制度のもと、太政官が政務に関して審議し、結論が出た事柄について、天皇に上奏すること。