Abstract: An information service apparatus for serving one of messages stored to a caller through a telephone line, comprises: message storing unit; a table unit for storing plural tables for forming a hierarchical system for reproduction of the messages, each of the tables storing address data of a set of tablets out of the plural tables, and an address of the one of the messages, and a given code; a signal detector for detecting a data signal sent though the telephone line; and a controller response to a call for executing a first function in which the controller accesses one of the tables to determine the present scene where one of the messages is served, reads the address data of the set of the tables to next access to either of the set of the tables in accordance with the data signal by the caller, reproduces one of the messages in accordance with the read address, and detects the given code.