An example image forming apparatus includes a memory, a print engine to perform a printing job, and a processor to store received user information in the memory when the user information of a group from among a plurality of groups is received from a server having the plurality of groups and user information of each of the plurality of groups, determine whether a user corresponding to a user terminal is a user belonging to the group when print data and user information are received from the user terminal, and control the print engine to print the print data based on the determination result.