Provided is a method for carrying out printing on the inner and outer surfaces of a building. The method includes printing print text on the inner and outer surfaces of the building by using a printing apparatus in which a printing ink to be used for a piezo method or a printing ink made of a UV curable material can be placed in a spray means according to a user's selection, the piezo method or a UV curing method can be selected according to the type of printing ink placed in the spray means, and spraying of the printing ink of the piezo method or the UV curing method, curing and spraying of a coating agent are sequentially carried out during driving since the spray means, a curing means and a coating agent application means are sequentially arranged.