A method of controlling an electronic apparatus, the method comprising: receiving measurement values for states of air displayed on a plurality of external electronic apparatuses (10, 20, 30) from each of the external apparatuses; calculating rates of change of the measurement values for each of the plurality of external electronic apparatuses based on the received measurement values; identifying first external electronic apparatuses of which differences of the calculated rates of change belong to a predetermined range among the plurality of external electronic apparatuses (10, 20, 30), and correcting the measurement values received from at least one external electronic apparatus among the identified first external electronic apparatuses to generate corrected measurement values such that the corrected measurement values are the same as one another; transmitting information related to the corrected measurement values to the at least one external electronic apparatus to allow the at least one external electronic apparatus to display the corrected measurement values; updating a setting to indicate that the plurality of external electronic apparatuses are electronic apparatuses located in a same space in consideration of common circumstances based on a user command input through an application installed on a mobile device, identifying second external electronic apparatuses of which differences of the rates of change do not belong to the predetermined range among the plurality of external electronic apparatuses (10, 20, 30); and transmitting a command for releasing the setting to indicate that the identified second external electronic apparatuses do not belong to the predetermined range to the mobile device. receiving measurement values for states of air displayed on a plurality of external electronic apparatuses (10, 20, 30) from each of the external apparatuses; calculating rates of change of the measurement values for each of the plurality of external electronic apparatuses based on the received measurement values; identifying first external electronic apparatuses of which differences of the calculated rates of change belong to a predetermined range among the plurality of external electronic apparatuses (10, 20, 30), and correcting the measurement values received from at least one external electronic apparatus among the identified first external electronic apparatuses to generate corrected measurement values such that the corrected measurement values are the same as one another; transmitting information related to the corrected measurement values to the at least one external electronic apparatus to allow the at least one external electronic apparatus to display the corrected measurement values; updating a setting to indicate that the plurality of external electronic apparatuses are electronic apparatuses located in a same space in consideration of common circumstances based on a user command input through an application installed on a mobile device, identifying second external electronic apparatuses of which differences of the rates of change do not belong to the predetermined range among the plurality of external electronic apparatuses (10, 20, 30); and transmitting a command for releasing the setting to indicate that the identified second external electronic apparatuses do not belong to the predetermined range to the mobile device.