An image processing apparatus is disclosed, including: a managing part, a use amount storing part, a setting part, and a determining part. The managing part manages a group threshold of a group including multiple members allowed to use the function for a use amount of the function. The use amount storing part stores a value of the use amount for each member. The setting part allocates the group threshold to the multiple members based on a value of a priority for each member in the group, and sets a member threshold for each member. The determining part determines whether a restriction concerning a use of the function is applied to a process of a use request, based on a result from comparing the value of the use amount with the member threshold for the request originator in response to the use request of the function.