A method for providing semi-automatic communication using a chatbot and a consultant device includes receiving, from a messenger server, a message input to an instant messaging application of a user device; determining a reliability for an automatic answer message made by the chatbot to answer the message; and transmitting the automatic answer message to the user device through the messenger server if the reliability is determined higher than a predetermined level, or enabling the consultant device to transmit a manual answer to the message if the reliability is determined lower than the predetermined level. The reliability is calculated based on a result of analysis for the message.