To facilitate the distribution and version-up of digital writing work by preventing the usage of the illegal copy of digital writing work.

A storage medium 1 is constituted of a ROM area for storing a key 21 and a RAM area 3 for storing digital writing work 31. The storage medium authenticating part 43 of a terminal equipment 4 judges whether or not the key 21 of the storage medium 1 exists in the ROM area 2. When the key is suitable, a digital writing work executing part 45 reads and executes digital work 31. A digital writing work updating part 46 requests the transmission of digital writing work to a distributing device 6 by accompanying an individual code. The distributing device 6 refers to a user management file in a storage device 62, checks the propriety of the individual code and distribution times and transmits the latest edition of digital writing work in the storage device 61 to the terminal equipment 4 when it is proper and, then, the digital writing work updating part 46 updates digital writing work 31.