An information processing device includes a storage in which a first program is stored and an update controller that updates the first program to a second program by use of data obtained from an external device. For each of a plurality of first partial areas obtained by dividing a first storage area storing the first program, the update controller copies a first partial program that is a part of the first program and that is stored in the first storage area to a second storage area and then successively updates the first partial program to a second partial program that is a part of the second program by use of the data. The data is difference information indicating a difference between the first program and the second program. The second storage area has a storage capacity smaller than a storage capacity of the first storage area.