Method and system for operating in-vehicle air conditioner

A system for operating an air conditioner installed in a vehicle, the system comprising:

• a vehicle terminal that controls an operation of the air conditioner;
• and
• a mobile terminal of an operator of the vehicle that communicates with the vehicle terminal, wherein:
• the vehicle terminal operates the air conditioner according to an operation instruction for the air conditioner when the operation instruction is received from the mobile terminal;
• the mobile terminal displays a notification related to the operation of the air conditioner on a screen of the mobile terminal while the air conditioner is operated according to the operation instruction;
• and
• when the mobile terminal is located outside the vehicle, the notification related to the operation of the air conditioner is continuously displayed on the screen without being deleted by a predetermined operation of the mobile terminal by the operator.