An information processing device is provided that enables an operator to efficiently carry out revision of an amount of removal of a workpiece at each block of a machining program. The information processing device includes a design data storage unit configured to store at least information relating to a workpiece, a simulation unit configured to carry out a simulation process of reproducing a positional relationship between the tool and the workpiece in a virtual space, a removal amount calculation unit configured to calculate an amount of removal of the workpiece by each block included in the machining program, the amount of removal being calculated on a per-block basis, and a display unit configured to display the blocks included in the machining program in a machining program display field in different display modes in accordance with the amounts of removal of the workpiece by the blocks.