To provide a game device capable of realizing a user interface, in a game in which a game character acts based on first and second parameters set by a user game, the user interface for enabling a user to relatively readily set the first and second parameters. A display control unit (88) displays an image in which a first coordinate axis corresponding to the first parameter and a second coordinate axis corresponding to the second parameter are shown in a game screen image showing the game character acting based on the first parameter and the second parameter. A coordinate value obtaining unit (90) obtains a first coordinate value corresponding to the first coordinate axis and a second coordinate value corresponding to the second coordinate axis in accordance with a direction designation operation or a position designation operation. A parameter update unit (94) updates the first parameter and the second parameter, based on the first coordinate value and the second coordinate value.