Provided is an electronic apparatus and a controlling method thereof the electronic apparatus includes: an interface connectable to a modular display apparatus including a plurality of display cabinets divided into a plurality of groups, the interface including a plurality of ports connectable to the plurality of groups; and a processor configured to: scale an image received from an external device based on a resolution of the modular display apparatus, re-scale the scaled image based on a resolution based on a user input, identify at least one group, among the plurality of groups, based on a position in which the re-scaled image is to be displayed, decompose the re-scaled image based on the identified at least one group, and control to transmit the decomposed re-scaled image to each of the identified at least one group through at least one port connected to the identified at least one group.