A remote support system includes: a terminal device; and a remote device, the terminal device including a first processor configured to: transmit, to the remote device, image information obtained by imaging a space including a target object; receive display information that is derived by the remote device in accordance with the image information and three-dimensional position information of an item included in the space, the display information indicating a display position and an orientation of a guidance image to be virtually displayed in a three-dimensional space in an imaging area for the target object; and display the guidance image by using the display information that is received, the remote device including a second processor configured to: receive the image information from the terminal device; derive the display information in accordance with the image information that is received and the three-dimensional position information; and transmit, to the terminal device, the display information that is derived.