According to one of aspects, a display device includes: a display unit configured to three-dimensionally display a planar object for executing processings related to spreadsheet, by displaying images respectively corresponding to both eyes of a user by being worn; a storage unit configured to store a rule in which operation to the object and a processing included in the processings are associated with each other; a detection unit configured to detect the operation; and a control unit configured to determine the processing to be executed according to the operation detected by the detection unit, based on the rule.