Operation data is acquired from either a first type of controller having a plurality of operation sections or a second type of controller having fewer operation sections, and a game process is performed. When the first type of controller is used for game operation, a selection item is switched in a forward direction for a plurality of items arranged in a predetermined order, in accordance with an operation on a first operation section, and the selection item is switched in a reverse direction in accordance with an operation on a second operation section. In addition, when the second type of controller is used for game operation, the selection item is switched in the forward direction in accordance with an operation on a third operation section of the second type of controller. Then, a UI image including these items is generated.