VEHICLE SYSTEM, CONTROL METHOD, AND STORAGE MEDIUM

A vehicle system executes a first operation of presenting lane change to an adjacent lane adjacent to a lane in which a host vehicle travels to a driver without considering of guiding the host vehicle to a set destination, and causing the host vehicle to perform the lane change on the basis of an instruction of the driver, a second operation for proposing a lane change required for guidance of the host vehicle to the destination to the driver and causing the host vehicle to perform a lane change on the basis of approval of the proposal by the driver, and a third operation for stopping presenting and proposing the lane change in a set period between the first operation and the second operation when a plan is to execute the second operation after the first operation.