In-vehicle display device, in-vehicle display method, and storage medium

An in-vehicle display method for causing an in-vehicle display terminal provided to a vehicle to display one of an in-vehicle image that is an image related to an in-vehicle device provided to the vehicle or a terminal image that is an image output from a mobile terminal carried by a passenger of the vehicle, the in-vehicle display method comprising:

• obtaining, by a first image obtainer, the terminal image from the mobile terminal;
• obtaining, by a second image obtainer, the in-vehicle image from the in-vehicle device;
• detecting, by a failure detector, a render failure in a process of generating the terminal image;
• and
• switching, by a display controller, an image to be displayed from the terminal image to the in-vehicle image when the failure detector detects the render failure in the process of generating the terminal image, and causing, by the display controller, the in-vehicle display terminal to display the in-vehicle image.