This invention is directed to the method and system of providing a call number owner's information to a communication terminal through an information communication network, comprising the steps of: (a) receiving a call number owner's information that includes at least a call number and a call number owner's name or its business name, from a plurality of call number owner's terminals and storing it; (b) receiving a call number taken from any one of a list of absent calls, received calls or sent calls held in a memory of the communication terminal, for which call number the owner's information is required by a call number management program run on the communication terminal; (c) reading the call number owner's information corresponding to the received call number in said (b) step from the stored call number owner's information in said (a) step and transmitting the information to the call number management program.