To efficiently manage information described on a notebook and a datebook, and constantly provide the latest application.

An electronic pen system comprises: writing sheets each having a position information pattern on the surface; a command area provided on the writing sheet; an electronic pen that reads the position information pattern and records the writing information by performing a writing operation on the surface of the writing sheet, and operates a function according to the writing to the command area; an information device wirelessly connected to the electronic pen; and an application server connected to the information device. The electronic pen system detects the position information on the command area by the electronic pen and actuates application software of the application server corresponding thereto.