1. An intersection guide system comprising: a memory storing a program; and a CPU that, when executing the program: acquires information on a path of a vehicle; acquires a travel direction of the vehicle at a guide intersection ahead of the vehicle on the basis of the information on the path; and causes a display to display a guide image that represents the travel direction as superimposed on a portion of a forward scene ahead of the vehicle other than an image of the guide intersection, and causing the display to display a connection line image as superimposed on the forward scene, the connection line image connecting between the image of the guide intersection in the forward scene and the guide image; and causes the display to display the connection line image as superimposed on the forward scene such that a length of the connection line image becomes shorter as a degree of approach of the vehicle to the guide intersection becomes larger.