A double-deck elevator group controller including a hall-installed car call registration device, cars of the first operation mode which are in charge of operation between even-numbered floors or between odd-numbered floors and cars of the second operation mode which serve all of the floors at which the cars can stop, are set, and in consideration of both combinations of boarding and alighting floors of registered from-hall car calls and an increment of the number of stops, the from-hall car calls are divided for assignment to the cars of the first operation mode and the cars of the second operation, whereby it is possible to meet from-hall car calls having arbitrary floors as the boarding and alighting floors and it is possible to improve the operation efficiency.