1. A method of recommending a friend, performed by a first terminal, the method comprising: detecting an event occurring in the first terminal; in response to analyzing the detected event, when it is determined that the detected event is a command to perform a sharing operation for sharing content and to select a zone to perform the sharing operation, transmitting a friend request message including information about the zone and the sharing operation to a second terminal, in response to receiving a friend acceptance message from the second terminal, displaying, on a screen of the first terminal, information recommending a user of the second terminal as a friend, sharing content, which is created within the zone on the first terminal with the second terminal, wherein the sharing of the content is performed while the first terminal and the second terminal are within the zone; and in response to analyzing the detected event, when it is determined that first interest keyword information is generated by the first terminal, receiving second interest keyword information of the second terminal, comparing the first interest keyword information and the second interest keyword information, and displaying, on the screen of the first terminal, information recommending a user of the second terminal as a friend based on a result of the comparing.