Method for ascertaining a journey route (R1, R2, R3) for a vehicle, in which a starting position and a destination position for the vehicle are ascertained, at least one driver state parameter (FP1, FP2, FP3) for a driver is captured, a value (KWFP) for a state of the driver is ascertained from the driver state parameter (FP1, FP2, FP3), at least one journey route (R1, R2, R3) from the starting position to the destination position is ascertained on the basis of the value (KWFP) for the state of the driver, and the ascertained journey route (R1, R2, R3) is displayed, characterized in that the value (KWFP) for the state of the driver is compared with a desired value range for the state of the driver, if the value (KWFP) for the state of the driver is within the desired value range, the value (KWFP) for the state of the driver is assigned to a first category, and, if the value (KWFP) for the state of the driver is outside the desired value range, the value (KWFP) for the state of the driver is assigned to a second category, wherein the desired value range for the state of the driver is ascertained from a history of values (KWFP) for the state of the driver that have been ascertained for the driver in the past, and wherein, if the value (KWFP) for the state of the driver is assigned to the first category, at least one journey route that has a level of difficulty on a first level is ascertained, and, if the value (KWFP) for the state of the driver is assigned to the second category, at least one journey route that has a level of difficulty on a second level is ascertained, wherein the level of difficulty of the journey route on the first level is higher than the level of difficulty of the journey route on the second level, a journey route with an increased level of difficulty requiring a particularly high level of attentiveness. a starting position and a destination position for the vehicle are ascertained, at least one driver state parameter (FP1, FP2, FP3) for a driver is captured, a value (KWFP) for a state of the driver is ascertained from the driver state parameter (FP1, FP2, FP3), at least one journey route (R1, R2, R3) from the starting position to the destination position is ascertained on the basis of the value (KWFP) for the state of the driver, and the ascertained journey route (R1, R2, R3) is displayed, the value (KWFP) for the state of the driver is compared with a desired value range for the state of the driver, if the value (KWFP) for the state of the driver is within the desired value range, the value (KWFP) for the state of the driver is assigned to a first category, and, if the value (KWFP) for the state of the driver is outside the desired value range, the value (KWFP) for the state of the driver is assigned to a second category, wherein the desired value range for the state of the driver is ascertained from a history of values (KWFP) for the state of the driver that have been ascertained for the driver in the past, and wherein, if the value (KWFP) for the state of the driver is assigned to the first category, at least one journey route that has a level of difficulty on a first level is ascertained, and, if the value (KWFP) for the state of the driver is assigned to the second category, at least one journey route that has a level of difficulty on a second level is ascertained, wherein the level of difficulty of the journey route on the first level is higher than the level of difficulty of the journey route on the second level, a journey route with an increased level of difficulty requiring a particularly high level of attentiveness.