An image processing apparatus that enables a user who is restricted in use of a function to use the restricted function easily and exactly only for a specific process flow. A function restriction unit restricts execution of a function of the image processing apparatus based on restriction information set for every user. A process-flow generation unit generates a process that is achieved by combining a plurality of functions as a process flow according to an instruction from a user. An authentication unit authenticates the user according to his user account. A storage unit stores a process flow that is generated by the process-flow generation unit according to an instruction from an authenticated first user as a process flow on which a second user who is restricted in use of at least one of functions included in the process flow can issue an execution instruction to an execution unit.