To provide a foot size measurement system which is suitable for easily measuring a size of a foot or shoe by a customer.SOLUTION: A portable terminal acquires a foot image obtained by photographing a foot installation sheet and whole body of a foot in a state of mounting a sole on the foot installation sheet in a state in which an end of a heel matches a lower side of the foot installation sheet, then, calculates an actual length ratio by dividing an actual length of a long side of the foot installation sheet by a pixel number of the long side of the foot installation sheet based on the foot image. Then, the foot image is rotated according to a rotation request, two vertical sliders 44a, 44b which can slide in a vertical direction on the foot image are moved according to a vertical slide request, then two lateral sliders 44c, 44d which can slide in a lateral direction on the foot image are moved according to a lateral slide request. Then, a size of a foot and a size of a shoe are calculated based on the actual length ratio, a pixel number between the vertical sliders 44a, 44b, and a pixel number between the lateral sliders 44c, 44d.SELECTED DRAWING: Figure 5
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