Video data on a field necessary for IP conversion and scanning line conversion is stored in a field memory section (7). Using the data stored in the field memory section a memory control section (2) performs vertical frequency conversion. An IP conversion section (3) performs IP conversion. A scanning line conversion section (4) performs scanning line conversion. A horizontal pixel conversion section(5) performs horizontal pixel conversion. A synchronization section (6) gives a predetermined clock, vertical and horizontal synchronizing signals to each block. Thus a single system performs vertical frequency conversion, IP conversion, scanning line conversion and horizontal pixel conversion.