An image processing apparatus, a session managing method, and a session managing program allow an operator to change his or her role flexibly. The image processing apparatus comprises a session managing unit for managing information about an operator who is logged in as a session, and a role determination unit for determining a role of the operator. The session managing unit includes a login session unit that is generated upon login of the operator, and a subject unit that generates information indicating the operator, a group to which the operator belongs, and an existing role of the operator. Upon request for a role change from the operator, the login session unit requests initialization of the subject unit. The subject unit then generates information indicating a role after role change based on the role after role change that is confirmed by the role determination unit.