A method for detecting body information on one or more passengers of a vehicle based on humans' status recognition, comprising steps of: (a) if at least one interior image of an interior of the vehicle is acquired, a passenger body information-detecting device performing (i) a process of inputting the interior image into a face recognition network, to thereby allow the face recognition network to detect each of faces of each of the passengers from the interior image, and thus to output multiple pieces of passenger feature information corresponding to each of the detected faces, and (ii) a process of inputting the interior image into a body recognition network, to thereby allow the body recognition network to detect each of bodies of each of the passengers from the interior image, and thus to output each of pieces of body-part length information of the each of the passengers corresponding to each of the detected bodies by referring to body parts per the passengers; and (b) the passenger body information-detecting device performing a process of retrieving one piece of height mapping information corresponding to one piece of passenger feature information on a passenger from a height mapping table which stores multiple pieces of height mapping information representing respective one or more predetermined ratios of one or more segment body portions of each of human groups to each of heights per each of the human groups, a process of acquiring a height of the passenger from the one piece of height mapping information by referring to at least one body-part length included in the one piece of body-part length information of the passenger, wherein at least one body-part corresponding to the at least one body-part length relates to at least one segment body portion included in the one piece of height mapping information, a process of retrieving weight mapping information corresponding to the passenger feature information from a weight mapping table which stores multiple pieces of weight mapping information representing predetermined correlations between each of the heights and each of weights per each of the human groups, and a process of acquiring a weight of the passenger from the weight mapping information by referring to the height of the passenger, wherein the multiple pieces of the passenger feature information include each of ages, each of genders and each of races corresponding to each of the passengers. (a) if at least one interior image of an interior of the vehicle is acquired, a passenger body information-detecting device performing (i) a process of inputting the interior image into a face recognition network, to thereby allow the face recognition network to detect each of faces of each of the passengers from the interior image, and thus to output multiple pieces of passenger feature information corresponding to each of the detected faces, and (ii) a process of inputting the interior image into a body recognition network, to thereby allow the body recognition network to detect each of bodies of each of the passengers from the interior image, and thus to output each of pieces of body-part length information of the each of the passengers corresponding to each of the detected bodies by referring to body parts per the passengers; and (b) the passenger body information-detecting device performing a process of retrieving one piece of height mapping information corresponding to one piece of passenger feature information on a passenger from a height mapping table which stores multiple pieces of height mapping information representing respective one or more predetermined ratios of one or more segment body portions of each of human groups to each of heights per each of the human groups, a process of acquiring a height of the passenger from the one piece of height mapping information by referring to at least one body-part length included in the one piece of body-part length information of the passenger, wherein at least one body-part corresponding to the at least one body-part length relates to at least one segment body portion included in the one piece of height mapping information, a process of retrieving weight mapping information corresponding to the passenger feature information from a weight mapping table which stores multiple pieces of weight mapping information representing predetermined correlations between each of the heights and each of weights per each of the human groups, and a process of acquiring a weight of the passenger from the weight mapping information by referring to the height of the passenger, wherein the multiple pieces of the passenger feature information include each of ages, each of genders and each of races corresponding to each of the passengers.