PURPOSE: To protect the personal privacy by providing an independent identification code to each information and therefore giving an access only to a desired one of plural pieces of information.

CONSTITUTION: A code deciding means 41 compares a person specifying code received from a keyboard 2 with that received from an identification code memory means 30 and outputs a coincidence signal if coincidence is obtained between both codes. A contents-based movable signal output means 42 receives said coincidence signal and actuates a timepiece means 43. When an owner inputs a contents-based code via the keyboard 2, the means 41 compares this code with plural contents-based codes stored in the means 30. Then an access is possible to the address of a data storing part 20 corresponding to the coincident contents-based codes. When a plate type memory medium is loaded under such conditions, the communication is carried out only with the data that is designated by said contents-based code among those data stored in the part 20.