The manual drive changing notification apparatus for a vehicle includes a communication unit configured to receive transmission data from a neighboring vehicle, a communication packet analyzer configured to analyze a communication packet of the transmission data to set a data format change level, a manual drive mode determination unit configured to analyze an autonomous driving environment of the neighboring vehicle based on the data format change level to determine a manual drive mode of a subject vehicle, a driver alarm strength setting unit configured to set a driver alarm strength for changing to the manual drive mode according to determination of the manual drive mode, and an alarm output unit configured to output an alarm according to the driver alarm strength.