A travel control method executed by a travel control apparatus, the travel control apparatus comprising: a GPS receiver receiving positional information of a subject vehicle from an external device; a first detector equipped in the subject vehicle and detecting a state of the subject vehicle for odometric position estimation of the position of the subject vehicle; and a second detector detecting a situation around the subject vehicle, the control method comprising: estimating an odometry estimation position of the subject vehicle using an odometry position estimation function on a basis of a detection result of the first detector; detecting a lane in which the subject vehicle travels, on a basis of a detection result of the second detector; performing a first determination process of determining whether or not the position of the subject vehicle based on the positional information is included in the lane detected on the basis of the detection result of the second detector and outputting a first determination result obtained by the first determination process; characterized by performing a second determination process of determining whether or not the odometry estimation position of the subject vehicle estimated on the basis of the detection result of the first detector is included in the lane detected on the basis of the detection result of the second detector and outputting a second determination result obtained by the second determination process; performing a position setting process of setting the position of the subject vehicle on the basis of the detection result of the first detector without using a current positional information received at the GPS receiver when the first determination result and the second determination result are not identical; and setting the position of the subject vehicle on the basis of the positional information when the first determination result and the second determination result are identical. a GPS receiver receiving positional information of a subject vehicle from an external device; a first detector equipped in the subject vehicle and detecting a state of the subject vehicle for odometric position estimation of the position of the subject vehicle; and a second detector detecting a situation around the subject vehicle, the control method comprising: estimating an odometry estimation position of the subject vehicle using an odometry position estimation function on a basis of a detection result of the first detector; detecting a lane in which the subject vehicle travels, on a basis of a detection result of the second detector; performing a first determination process of determining whether or not the position of the subject vehicle based on the positional information is included in the lane detected on the basis of the detection result of the second detector and outputting a first determination result obtained by the first determination process; characterized by performing a second determination process of determining whether or not the odometry estimation position of the subject vehicle estimated on the basis of the detection result of the first detector is included in the lane detected on the basis of the detection result of the second detector and outputting a second determination result obtained by the second determination process; performing a position setting process of setting the position of the subject vehicle on the basis of the detection result of the first detector without using a current positional information received at the GPS receiver when the first determination result and the second determination result are not identical; and setting the position of the subject vehicle on the basis of the positional information when the first determination result and the second determination result are identical. estimating an odometry estimation position of the subject vehicle using an odometry position estimation function on a basis of a detection result of the first detector; detecting a lane in which the subject vehicle travels, on a basis of a detection result of the second detector; performing a first determination process of determining whether or not the position of the subject vehicle based on the positional information is included in the lane detected on the basis of the detection result of the second detector and outputting a first determination result obtained by the first determination process; characterized by performing a second determination process of determining whether or not the odometry estimation position of the subject vehicle estimated on the basis of the detection result of the first detector is included in the lane detected on the basis of the detection result of the second detector and outputting a second determination result obtained by the second determination process; performing a position setting process of setting the position of the subject vehicle on the basis of the detection result of the first detector without using a current positional information received at the GPS receiver when the first determination result and the second determination result are not identical; and setting the position of the subject vehicle on the basis of the positional information when the first determination result and the second determination result are identical.