A write operation supporting apparatus 1 includes a camera 3 that images a placed document 10 as a reading target within an imaging area 6 and a projector 4 that displays information toward the imaging area 6. A control device 5 of the write operation supporting apparatus 1 displays, by the projector 4, operation supporting information for supporting an information writing operation using the document 10 toward the imaging area 6, based on positional information of the document 10 on the imaging area 6 acquired by the camera 3, with relative position relation with the medium 10 on the imaging area 6 maintained.