Abstract: [Subject] The usefulness of calendar apparatus which matched annual code with date is improved. [Solution means] Monthly sheet processing means which makes daily records correspond to annual code and date, and indicates by list, annual sheet processing means which indicates clickable annual code button by list, the first day of the code setup means which sets first day of the code as the days and months which a user wishes while displaying that which started processing and with which it already registered of daily records by clicking annual code button, daily records processing means which processes initial registration and renewal registration, a search is performed to daily records and it has record search means which makes the search results correspond to annual code and date, and displays them. It has the correspondence relation between annual code and date as a correspondence table of annual code and date.