A computer-implemented information acquisition method for estimating a skeleton of a living human body, comprising: causing a skeleton estimation unit to estimate the skeleton of the living human body using captured image data showing the living human body, characterized by further comprising: causing a calculation unit to calculate a first length equivalent to a length of a first skeleton forming a part of a body height of the living human body, the first length being obtained by subtracting a specified value (LA, LB) from the body height included in attribute data, and to calculate a length of a target portion of the living human body using ratios among skeletons including the first skeleton in the estimated skeleton, and the first length, wherein the first skeleton is between a predetermined position of a head and a predetermined position of a foot in the skeleton, and the specified value (LA, LB) is a value obtained by adding a first specified value equivalent to a length between the predetermined position of the head and a head top position in the skeleton, and a second specified value equivalent to a length between a predetermined position of the foot and a sole position in the skeleton. causing a skeleton estimation unit to estimate the skeleton of the living human body using captured image data showing the living human body, characterized by further comprising: causing a calculation unit to calculate a first length equivalent to a length of a first skeleton forming a part of a body height of the living human body, the first length being obtained by subtracting a specified value (LA, LB) from the body height included in attribute data, and to calculate a length of a target portion of the living human body using ratios among skeletons including the first skeleton in the estimated skeleton, and the first length, wherein the first skeleton is between a predetermined position of a head and a predetermined position of a foot in the skeleton, and the specified value (LA, LB) is a value obtained by adding a first specified value equivalent to a length between the predetermined position of the head and a head top position in the skeleton, and a second specified value equivalent to a length between a predetermined position of the foot and a sole position in the skeleton. causing a calculation unit to calculate a first length equivalent to a length of a first skeleton forming a part of a body height of the living human body, the first length being obtained by subtracting a specified value (LA, LB) from the body height included in attribute data, and to calculate a length of a target portion of the living human body using ratios among skeletons including the first skeleton in the estimated skeleton, and the first length, wherein the first skeleton is between a predetermined position of a head and a predetermined position of a foot in the skeleton, and the specified value (LA, LB) is a value obtained by adding a first specified value equivalent to a length between the predetermined position of the head and a head top position in the skeleton, and a second specified value equivalent to a length between a predetermined position of the foot and a sole position in the skeleton.