A slip processing method for simplifying a processing of a job which uses a form of a predetermined format at a frequency of once a long term such as month, quarter or year and in which an input form is changed at a frequency of once per several times of use. The method comprises storing format information of an input form and data information in one file, providing a format of the input form including a plurality of tables each comprising a plurality of items (cells), storing data in corresponding ones of the items, executing a retrieval of the items and a totalization of data in the items with referencing a file which stores the format information and the data of the input form and storing the format information and the data of the input form and the processed information in a form which is transmittable through a network.