Patent ID: 7757131

Claim:
An image forming apparatus capable of executing a plurality of functions, comprising: an operating portion to which an operation instruction is inputted by an operator; a display portion for displaying an operation guide to the operator; an error detecting portion for detecting an occurrence of an operation error; and a display controller for causing a screen displayed on the display portion to differ depending on whether or not the error detecting portion is detecting any operation error if an operation instruction is inputted to the operation portion by the operator, wherein: the operating portion includes function switch instruction input portion to which a function switch instruction to switch a function to be executed is inputted by the operator; the apparatus further comprises judging portion for judging whether or not a function indicated by the function switch instruction inputted to the function switch instruction input portion is executable even if the operation error detected by the error detecting portion continues; and the display controller causes the display portion to display an occurrence of an operation error if the error detecting portion is detecting any operation error; and the display controller causes the display portion to display an instruction receiving screen for receiving an instruction for a corresponding function when a function switch instruction is inputted to the function switch instruction input portion during the display of the occurrence of the operation error, and the judging portion judges whether or not an operation based on the function indicated by the function switch instruction is executable even during the occurrence of the operation error, and the judging portion judges that the operation based on the function indicated by the function switch instruction is executable even during the occurrence of the operation error.