A drive assist system includes an occupant monitoring apparatus, an information acquisition apparatus, a determination apparatus, and a drive assist apparatus. The drive assist apparatus includes one or more processors, and one or more memories coupled to the one or more processors to communicate therewith. The one or more processors appropriately change a warning timing or a drive assist control intervention timing in accordance with the sleep state of a driver of a vehicle at least from a previous day, upon receiving information, from the determination apparatus, that the vehicle transitions from a stopped state to a traveling state. The warning timing is a timing of giving a warning that the vehicle is approaching another vehicle, or the like. The drive assist control intervention timing is a timing of intervention by the drive assist control for avoiding contact between the vehicle and the other vehicle or the like.