The present invention is to provide a server and a method for three-dimensional output that easily determines the user's line of sight in a virtual reality space. The server for three-dimensional output being communicatively connected with a head mounted display outputting full dome three-dimensional space data as virtual or augmented reality corresponding to a user's line of sight sequentially transmits screen data to be output to and displayed on the head mounted display; receives data on the turn in the yaw direction and the pitch direction of the head mounted display from the head mounted display; changes the screen data based on the received turn in the yaw direction and the pitch direction of the head mounted display; and changes avatar data on the user of the head mounted display based on the received turn in the yaw direction and the pitch direction of the head mounted display.