Semiconductor device and message image output method

A semiconductor device which outputs a message image signal being a signal of a message image to be projected onto a periphery of a mobile, the semiconductor device comprising:

• a first area decision part which decides based on movement information of the mobile, a first area being an area onto which the message image is projected at a first time being a schedule time when the message image is to be projected;
• a delay period calculation part which calculates a delay period being a period from the first time when the message image is projected onto the first area to a second time when the message image is projectable;
• a second area decision part which adjusts the first area on the basis of the movement information and the delay period to decide a second area;
• and
• an image signal conversion part which converts the message image signal according to the second area.