A personalized messaging service system includes an artist terminal in which an artist app is installed and communicates with a central server, and an artist message including an identification code is registered through the artist app, a user terminal on which each user app is installed and communicates with a central server, and a personalized message converted from the artist message is displayed based on the identification code, and a central server communicating with the user terminal and the artist terminal. The user app includes a user login service unit providing login services for user accounts, a message sending control unit to limit sending of user messages according to predetermined standards, based on user information of the user account, and a user chat service unit to send the user message and display a personalized message converted from the artist message based on the identification code in a chat window.