A method of sharing profile image cards of a user of a device is provided. The method may be performed by a server and includes obtaining profile image cards indicating profiles of a first user of a first device related to a field of interest of the first user, categorizing the profile image cards based on pre-set categories, obtaining evaluation information of a second user of a second device regarding the profile image cards, determining rankings of the profile image cards for each of the categories based on the evaluation information, and recommending the profile image cards to at least one other device based on the rankings of the profile image cards.