A computer sewing machine having a plurality of sewing related operating functions and including voice generating components driven by a drive signal and producing voice information concerning various information items including at least malfunctioning and their explanations and handling and their explanations for the sewing machine, process designation input components for producing signals for starting the process of the information items produced from the voice generating means, response input components including at least two switches selectively operated to produce signals to affirm or negate the information items produced by the voice generating components, reception/discrimination components for receiving the signals from the process designation input components and from the response input components to discriminate the designation of the information items, a stitch control device, malfunction diagnosing components for diagnosing malfunctions of the sewing machine on the basis of control operation of the stitch control device to produce signals indicating a malfunction of the sewing machine, specifying components for receiving the signals from the malfunction diagnosing components and from the reception/discrimination components to specify the information items, a language signal storing memory containing language signals, and language synthesizing components operated by the signal from the specifying components.