Method to search for affinities between subjects and relative apparatus

A method to search for affinities between subjects comprises the passages of effecting a step of registering a user with a certification authority (14), effecting a step of receiving first information relating to the user and memorizing the first information in a portable electronic device (11) of the user, and effecting a step of synthesizing the first information memorized in the portable electronic device (11) by means of transmission to a user interface (13) which processes the first information memorized. The method also comprises the passages of effecting a step of encrypting the first information and memorizing the first information encrypted in the portable electronic device (11), effecting a step of disseminating the first encrypted information to other portable electronic devices (11) in geographical proximity, effecting a step of collecting second encrypted information relating to other users, sent from other portable electronic devices (11) in geographical proximity and effecting a step of decrypting the first and second information encrypted at the certification authority (14). Finally, the method provides to effect a step of processing and analyzing the first and second decrypted information, in order to identify affinities between them, at the certification authority (14), and to effect a step of notifying the affinities, by means of the certification authority (14).