Method for encoding/decoding image and device therefor

A video encoding method comprising:

• determining a first data unit according to a first intra prediction type that predicts using predetermined prediction information and a second data unit according to a second intra prediction type that predicts using data units adjacent to the second data unit;
• generating a first prediction value with respect to the first data unit predicted according to the first intra prediction type by using the predetermined prediction information;
• generating a second prediction value with respect to the second data unit predicted according to the second intra prediction type by using the data units adjacent to the second data unit;
• and
• generating a bitstream comprising encoding information determined based on at least one of the first prediction value and the second prediction value to encode a video picture,
• wherein the bitstream comprises the predetermined prediction information.

A video decoding apparatus comprising:

• a data unit determiner configured to determine data units for intra prediction from a video picture;
• a bitstream obtainer configured to obtain, from a bitstream, intra prediction type information indicating whether to predict the data units according to a first intra prediction type that predicts using predetermined prediction information or a second intra prediction type that predicts using data units adjacent to the data units;
• and
• a decoder configured to determine a first data unit predicted according to the first intra prediction type and a second data unit predicted according to the second intra prediction type, based on the intra prediction type information obtained from the bitstream, generate a first prediction value with respect to the first data unit predicted according to the first intra prediction type using the predetermined prediction information, and generate a second prediction value with respect to the second data unit predicted according to the second intra prediction type using the data units adjacent to the data units.