To provide a contact destination management system and a contact destination management program, allowing an addressee to determine a desired identification auxiliary code as an identification auxiliary code for identifying contact destination data to be registered.

This contact destination management system 10 connected to user terminals 6, 7 via a network 5 has: a contact destination registration part 1 registering the contact destination data inputted from the user terminal 6 of the addressee, including a name and the identification auxiliary code in a storage part 3; and a contact destination browsing part 2 acquiring the contact destination data of the addressee from the storage part 3 on the basis of the identification auxiliary code of the addressee and the name of the addressee, inputted from the user terminal 7 of a sender, and transmitting them to the sender.